Pat Gibson holds a drawing of Meadow Pollack, a victim of the Marjory Stoneman Douglas High School shooting, as she stands outside of the school as part of a nationwide protest against gun violence, Wednesday, March 14, 2018, in Parkland, Fla. (AP Photo/Lynne Sladky)

Nikki Brown, center, hugs others in front of Forest High School Friday, April 20, 2018 in Ocala, Fla.  One student shot another in the ankle at the high school and a suspect is in custody, authorities said Friday.  The injured student was taken to a local hospital for treatment.  (Doug Engle /Star-Banner via AP)

Nikolas Cruz is lead into the courtroom before being arraigned at the Broward County Courthouse in  Fort Lauderdale, Fla., on Wednesday, March 14, 2018. Cruz is accused of opening fire at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, killing 17 students and adults.  (Amy Beth Bennett/South Florida Sun-Sentinel via AP, Pool)

A group of about 40 students make their way along Old Highway 92 south of Evansville, Wis., on Tuesday, March 27, 2018,  as they march to U.S. Rep. Paul Ryan's hometown of Janesville to call for stricter gun control laws. An end-of-march event is scheduled at Traxler Park in Janesville on Wednesday, March 28 at noon. (Anthony Wahl/The Janesville Gazette via AP)

FILE - In this Jan. 19, 2016, file photo, former Pennsylvania Sen. Rick Santorum meets with voters in Greenfield, Iowa. On Sunday, March 25, 2018, Santorum said students who are rallying for gun control should instead learn CPR to help protect their classmates during a school shooting. (AP Photo/Evan Vucci, File)

This undated photo provided by the Willey family shows Jaelynn Willey. A teenager armed with a handgun shot and critically wounded Willey inside a Maryland school on Tuesday, March 20, 2018, and the shooter was killed when a school resource officer confronted him moments after the gunfire erupted. A third student was in good condition after he was shot. (Courtesy of the Willey family via AP)

Marjory Stoneman Douglas High School students, and mass shooting survivors, from left, Emma Gonzalez, David Hogg, Cameron Kasky and Alex Wind participate in a panel discussion about guns, Tuesday, March 20, 2018, at Harvard Kennedy School's Institute of Politics, in Cambridge, Mass. The Feb. 14, 2018, attack in Florida killed 17 people, 14 of them students. The students have become vocal advocates for stricter gun laws. (AP Photo/Steven Senne)