"Keep at it. You're leading us forward. Nothing can stand in the way of millions of voices calling for change." Former President Barack Obama tweets his support for students marching across the US to demand gun control.

"Keep at it. You're leading us forward. Nothing can stand in the way of millions of voices calling for change." Former President Barack Obama tweets his support for students marching across the US to demand gun control. https://t.co/rC6dC3CRqt pic.twitter.com/2BJFSRTXFh

— CNN (@CNN) March 24, 2018