Ryan Routh, who was arrested in the latest Trump assassination attempt, has a history of violence. He should've never had access to an assault weapon.

An engineer who spent decades designing weapons for one of the world’s leading gun manufacturers testified Tuesday that the assault-style weapons now banned in Illinois are intended only for civilian use and cannot be easily converted into military-grade firearms.

When asked about gun control, Harris said she is not looking to confiscate guns from lawful owners. "We’re not trying to take anybody’s guns away from them but we do need an assault weapons ban,” she said.

It's been 20 years since the federal assault weapons ban expired. CBS News homeland security and justice reporter Nicole Sganga reports on the impact and talks to March Fourth founder and co-president Kitty Brandtner about the importance of the 1994 law.