“There’s no reason someone needs a weapon of war with 100 rounds, 100 bullets, that can be fired from that weapon. Nobody needs that, nobody needs that,” Biden said in the Rose Garden.

He mentioned that Congress passed a 10-year ban on assault weapons in 1994 under President Clinton, when Biden served in the Senate. It expired in 2004. 

https://thehill.com/homenews/administration/547162-biden-calls-for-ban-on-assault-weapons-and-high-capacity-magazines/