This March 14, 2018 file photo shows students sitting in silence as they rally in front of the White House in Washington. Students walked out of school to protest gun violence in the biggest demonstration yet of the student activism that has emerged in response to February's massacre of 17 people at Florida's Marjory Stoneman Douglas High School.
This March 14, 2018 file photo shows students sitting in silence as they rally in front of the White House in Washington. Students walked out of school to protest gun violence in the biggest demonstration yet of the student activism that has emerged in response to February's massacre of 17 people at Florida's Marjory Stoneman Douglas High School. Carolyn Kaster Associated Press
This March 14, 2018 file photo shows students sitting in silence as they rally in front of the White House in Washington. Students walked out of school to protest gun violence in the biggest demonstration yet of the student activism that has emerged in response to February's massacre of 17 people at Florida's Marjory Stoneman Douglas High School. Carolyn Kaster Associated Press