WPLG-TV via AP
In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting on Feb. 14, 2018.
John McCall / South Florida Sun-Sentinel
Police officers tend ride in the back of a pick-up truck with a victim outside of Stoneman Douglas High School in Parkland, Fla., after a shooting on Feb. 14, 2018.
John McCall / South Florida Sun-Sentinel
Medical personnel tend to a victim following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Gerald Herbert / AP
Mourners leave the funeral of Meadow Pollack, a victim of the Wednesday shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., Feb. 16, 2018. Nikolas Cruz, a former student, was charged with several counts of premeditated murder on Thursday.
Matt McClain / The Washington Post
People leave an orientation for students at Marjory Stoneman Douglas High School on Sunday in Parkland, Florida, where students will return to classes Wednesday for the first time since the Feb. 14 shooting.
Matt McClain / The Washington Post
People gather for a candlelight vigil in honor of the victims of the Marjory Stoneman Douglas High School shooting. Some of those who survived the rampage were demanding to know why the adults who run the country had not done more to prevent it.
Rhona Wise / AFP/Getty Images
Mourners gather during a vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.
John McCall / South Florida Sun-Sentinel
A law enforcement officer rushes toward Marjory Stoneman Douglas High School following a shooting at the school in Parkland, Fla., on Feb. 14, 2018.
Matt McClain / The Washington Post
Alexandra Geisser, 16, embraces a therapy dog named, Mickey, outside Marjory Stoneman Douglas High School as students and family members take part in an orientation Sunday before classes resume Wednesday. There were several therapy dogs on site for students to interact with.
Taimy Alvarez / Sun-Sentinel
Jason Wang, center, holds a picture of his brother Peter, along with his younger brother, Alex, after his brother's funeral in Coral Springs, Fla., on Feb. 20, 2018.
Wilfredo Lee / AP
Law enforcement officers block off the entrance to Marjory Stoneman Douglas High School, Feb. 15, 2018 in Parkland, Fla.
Joe Raedle / Getty Images
People arrive for the funeral of Alyssa Alhadeff at the Garden of Aaron at Star of David Memorial Gardens on Feb. 16, 2018, in Parkland, Florida. Alhadeff was one of 17 people killed in the shooting at Marjory Stoneman Douglas High School.
Amy Beth Bennett / South Florida Sun-Sentinel
Waiting for word from students, anxious family members gather at Coral Springs Drive and the Sawgrass Expressway, after a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
MICHELE EVE SANDBERG / AFP/Getty Images
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles north of Miami on February 14, 2018.
Joe Raedle / Getty Images
Tyra Heman, a senior at Marjory Stoneman Douglas High School, holds a sign on Feb. 20, 2018, that reads, "Enough No Guns" in front of the school where 17 people were killed on Feb. 14 in Parkland, Fla.
John McCall / South Florida Sun-Sentinel
Students released from a lockdown walk away following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Brynn Anderson / AP
A young girl and a woman embrace as they leave a funeral service for Alyssa Alhadeff at the Star of David Funeral Chapel in North Lauderdale, Fla., Friday, Feb. 16, 2018. Alhadeff was one of the victims of Wednesday shooting at Marjory Stoneman Douglas High School.
Susan Stocker / South Florida Sun-Sentinel
A video monitor shows school shooting suspect Nikolas Cruz, left, making an appearance before Judge Kim Theresa Mollica in Broward County Court, Thursday, Feb. 15, 2018, in Fort Lauderdale, Fla.
Wilfredo Lee / AP
Parents wait for news after a reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Amy Beth Bennett / South Florida Sun Sentinel
Linda Barrio crosses herself as she prays Feb. 16, 2018, at a memorial at Pine Trails Park in Parkland for the 17 people killed Wednesday at Marjory Stoneman Douglas High School. "I don't know how it's [school violence] going to end," Barrio said. "I just wish there was something we could've done to stop this."
John McCall / South Florida Sun Sentinel
Students are released from a lockdown outside of Marjory Stoneman Douglas High School in Parkland, Fla., after reports of an active shooter on Feb. 14, 2018.
Joe Raedle / Getty Images
People are brought out of Marjory Stoneman Douglas High School after a shooting at the school on Feb. 14, 2018, in Parkland, Fla.
Scott Keeler / Tampa Bay Times
Pinellas Sheriff Bob Gualtieri, right, responds to a question from Florida Gov. Rick Scott, back, on gun violence during a meeting at Florida's Capitol, Tallahassee.
Matt McClain / The Washington Post
Marianna Guttierez, 14, center right, and other students of Marjory Stoneman Douglas High School gather with others for a candlelight vigil in honor of the victims of the school shooting on Thursday in Parkland, Florida.
Amy Beth Bennett / South Florida Sun Sentinel
Maria Creed is overcome with emotion as she crouches in front of one of the memorial crosses at Pine Trails Park in Parkland on Feb. 16, 2018. White crosses memorialize the 17 people killed Wednesday at Marjory Stoneman Douglas High School. Creed's son, Michael Creed, is a sophomore at the school.
Gerald Herbert / AP
A woman places a poster of shooting victim Meadow Pollack at one of seventeen crosses, after a candlelight vigil for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.
Mark Wilson / Getty Images
Student Kelsey Friend gets help wiping away her tears after recounting her story aboutWednesday's mass shooting at the Marjory Stoneman Douglas High School where 17 people were killed, on February 15, 2018 in Parkland, Florida.
Mark Wilson / Getty Images
Kristi Gilroy hugs a young woman at a police checkpoint near the Marjory Stoneman Douglas High School where 17 people yesterday were killed by a gunman on February 15, 2018 in Parkland, Florida.
Mark Wilson / Getty Images
Candles that were placed on crosses still glow after last night's vigil for victims of the mass shooting at Marjory Stoneman Douglas High School, at Pine Trail Park, on Feb. 16, 2018, in Parkland, Fla.
Wilfredo Lee / AP
Zachary Haupert, 14, painted "RIP Luke," on his hoodie in honor of his friend, Luke Hoyer, who was one of the victims of the shooting at Marjory Stoneman Douglas High School on Feb. 14, 2018.
Matt McClain / The Washington Post
People arrive for a candlelight vigil in honor of the victims of the Marjory Stoneman Douglas High School shooting in Parkland Florida. On Capitol Hill, some Republican and Democratic senators struggled to say what lawmakers would do in response to the shooting.
Joe Raedle / Getty Images
Mourners leave the funeral of Peter Wang, 15, who was a JROTC cadet, on Feb.20, 2018 in Coral Springs, Florida. Wang was killed in the mass shooting at Marjory Stoneman Douglas High School along with 16 other people.
Amy Beth Bennett / South Florida Sun-Sentinel
People gather waiting for word from students near Marjory Stoneman Douglas High School in Parkland, Fla., following a shooting at the school on Feb. 14, 2018.
Mark Wilson / Getty Images
Students and family members hold candles during a vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.
Michele Eve Sandberg / AFP/Getty Images
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., onFeb. 14, 2018.
Joel Auerbach / AP
Parents wait for news after a reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
WPLG-TV via AP
In this frame grab from video provided by WPLG-TV, students from the Marjory Stoneman Douglas High School in Parkland, Fla., evacuate the school following a shooting on Feb. 14, 2018.
Gerald Herbert / AP
Austin Burden, 17, cries on the shoulder of a friend after a vigil at the Parkland Baptist Church, for the victims of the Wednesday shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., Feb. 15, 2018.
Mark Wilson / Getty Images
A women breaks down with emotion during a prayer vigil for famlies of Marjory Stoneman Douglas High School, where a mass shooting took place, at the Parkridge Church, on February 15, 2018 in Parkland, Florida.
Miguel Guttierez / AFP/Getty Images
This video image shows shooting suspect Nikolas Cruz on February 15, 2018 at Broward County Jail in Ft. Lauderdale, Florida. The heavily armed teenager who gunned down students and adults at a Florida high school was charged Thursday with 17 counts of premeditated murder, court documents showed.
Gerald Herbert / AP
A woman weeps as she sits outside the Temple K'ol Tikvah before the funeral of Meadow Pollack, a victim of the Wednesday shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., Feb. 16, 2018.
Rhona Wise / AFP/Getty Images
Mourners hug after placing flowers on a makeshift memorial honoring the victims of Marjory Stoneman Douglas High School shooting in Parkland, Fla.
Mike Stocker / Sun-Sentinel
Students from Marjory Stoneman Douglas High School get ready to board a bus for a trip to Tallahassee, Fla. on Feb. 20, 2018 to talk with lawmakers about the recent rampage at their school and what needs to be done to make sure it doesn't happen again.
Mark Wilson / Getty Images
Candles that were placed on crosses still glow after last nights vigil for victims of the mass shooting at Marjory Stoneman Douglas High School, at Pine Trail Park, on Feb. 16, 2018, in Parkland, Fla.
Michele Eve Sandberg / AFP/Getty Images
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Mark Wilson / Getty Images
Sheree Spaulding walks with her 15-year-old son, Justin Spauling, who is a 9th grader at the Marjory Stoneman Douglas High School where 17 people were killed by a gunman yesterday, on February 15, 2018 in Parkland, Florida.
Rhona Wise / AFP/Getty Images
Mourners hug during a prayer vigil for the victims of the Marjory Stoneman Douglas High School shooting at Parkridge Church in Coral Springs, Florida on February 15, 2018.
Taimy Alvarez / Sun-Sentinel
Peter Wang's mother, Hui, cries as she is helped into a waiting car with her family after the memorial service for her 15-year-old son in Coral Springs, Fla., on Feb. 20, 2018.
Mike Stocker / South Florida Sun Sentinel
Mourners gather at Parkridge Church in Coral Springs for a noon vigil to honor those who where killed in Wednesday's mass shooting at Marjory Stoneman Douglas High School, Feb. 15, 2018.
Matt McClain / The Washington Post
People gather for a candlelight vigil Thursday in honor of the victims of the Marjory Stoneman Douglas High School shooting in Parkland, Florida.
Gerald Herbert / AP
Organizers Cameron Kasky, left, and Jackie Corin, student survivors from Marjory Stoneman Douglas High School, address fellow students before boarding buses in Parkland, Fla., on Feb. 20, 2018, to rally outside the state capitol.
Gerald Herbert / Associated Press
People comfort each other at a public memorial for the victims of the Wednesday shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., Feb. 16, 2018.
Gerald Herbert / AP
Two people comfort each other as they sit and mourn at one of seventeen crosses, after a candlelight vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.
Mark Wallheiser / AP
Sheryl Acquarola, a 16 year-old junior from Marjory Stoneman Douglas High School, is overcome with emotion at the Florida House of Representatives after legislators voted not to hear a bill banning assault rifles and large capacity magazines in Tallahassee, Fla., on Feb 20, 2018.
John McCall / South Florida Sun-Sentinel
People embrace after students werereleased from a lockdown following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Gerald Herbert / AP
People pray around one of seventeen crosses after a candlelight vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.
Wilfredo Lee / AP
Anxious family members watch a rescue vehicle pass by on Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School school sent students rushing into the streets as SWAT team members swarmed in and locked down the building.
Wilfredo Lee / AP
One of 17 angel sculptures is shown before a candlelight vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Rhona Wise / AFP/Getty Images
Mourners pray during a prayer vigil for the victims of the Marjory Stoneman Douglas High School shooting at Parkridge Church in Coral Springs, Florida on February 15, 2018.
John McCall / South Florida Sun-Sentinel
Students released from a lockdown are overcome with emotion following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 14, 2018.
Wilfredo Lee / AP
A student shows a law enforcement officer a photo or video from his phone on Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building.
Rhona Wise / AFP/Getty Images
A mourner kneels in front of a makeshift memorial for the victims of Marjory Stoneman Douglas High School shooting in Parkland, Fla.
Rhona Wise / AFP/Getty Images
Thousands of mourners attend a candlelight vigil Feb. 15 for the victims of the shooting at Marjory Stoneman Douglas High School, in Parkland, Fla., on Feb. 14, 2018.