Montgomery County students demonstrate in front of the White House in Washington

Students who walked out of their Montgomery County, Maryland, schools protest against gun violence in front of the White House in Washington, U.S., February 21, 2018. REUTERS/Kevin Lamarque - RC164B322F90

Students who walked out of their Montgomery County, Maryland, schools protest against gun violence in front of the White House in Washington, U.S., February 21, 2018. REUTERS/Kevin Lamarque - RC164B322F90