HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR:

The mass shootings in Aurora, Tucson, Newtown and other cities have not led to stricter national gun laws or even tougher background checks, but a new proposal may change that. Texas Republican Senator John Cornyn is sponsoring a bill to help states better report people known to be mentally ill to the FBI database of individuals prohibited from buying guns.

Joining me now for more on this development is "Washington Post" reporter Mike DeBonis.

So, I remember after in 2013 sort of gun control legislation, after the Newtown massacre didn't go very far. What's so different about this?