Trump says Iran 'starting to' cross US red lines as protesters die in government crackdown

President Donald Trump said Sunday that Iran is "starting to" cross U.S. red lines, citing reports of civilian deaths and warning that any attack on American interests would be met with overwhelming force as his administration weighs what he called "very strong options."

Trump spoke to reporters aboard Air Force One while traveling from Palm Beach, Florida, back to Washington, D.C., after being asked whether Iran had crossed a threshold that would trigger a response.

"They're starting to, it looks like, and there seem to be some people killed that aren't supposed to be killed," the president said. "These are violent — if you call them leaders, I don't know if their leaders or just if they rule through violence. And, we're looking at some very strong options. We’ll make a determination."