This Thursday marks the first anniversary of the massacre at the Marjory Stoneman Douglas High School, where 17 students and staff members were killed. David Hogg, a 2018 graduate of Marjory Stoneman Douglas High School and co-founder of "March For Our Lives,” joins Andrea Mitchell.

Code: MARCH. Get An Additional 20% Off on Clearance at Eastern Mountain Sports! Shop Now and Save!

More videos