WASHINGTON (AP) — The nation should keep assault rifles out of the hands of anyone under 21, President Donald Trump declared Thursday, defying his loyal supporters in the National Rifle Association amid America's public reckoning over gun violence. He also pushed hard for arming security guards and many teachers in U.S. schools.

"There's nothing more important than protecting our children," Trump said, adding that he'd spoken with many members of Congress and NRA officials and insisting they would go along with his plans in the wake of last week's school shooting in Parkland, Florida, that lef...