PHILADELPHIA, PA – MARCH 14: Students at Philadelphia High School of Creative And Performing Arts participate in a walkout to address school safety and gun violence on March 14, 2018 in Philadelphia, Pennsylvania. Students across the country are walking out of classes for 17 minutes to honor the lives of the 17 people killed at Stoneman Douglas High School in Florida this past February. (Photo by Jessica Kourkounis/Getty Images)
PHILADELPHIA, PA – MARCH 14: Students at Philadelphia High School of Creative And Performing Arts participate in a walkout to address school safety and gun violence on March 14, 2018 in Philadelphia, Pennsylvania. Students across the country are walking out of classes for 17 minutes to honor the lives of the 17 people killed at Stoneman Douglas High School in Florida this past February. (Photo by Jessica Kourkounis/Getty Images)