Trump says he'd arrest Gov. Newsom

Driving the news: "I would do it if I were Tom. I think it's great," the president told a reporter, referring to border czar Tom Homan.

• "Look, I like Gavin Newsom. He's a nice guy. But he's grossly incompetent," Trump said.

Homan previously told NBC News that he wouldn't rule out arresting Democratic officials if they impede law enforcement or harbor undocumented immigrants.

• In response, Newsom has dared Homan to arrest him.
• "Come and get me, tough guy," Newsom wrote in response Sunday.

What he's saying: "The President of the United States just called for the arrest of a sitting Governor. This is a day I hoped I would never see in America," Newsom wrote in a post on X in response to Trump's comments.

• The governor added, "I don't care if you're a Democrat or a Republican this is a line we cannot cross as a nation — this is an unmistakable step toward authoritarianism."

Zoom out: Earlier Monday, Newsom said California will sue Trump, saying the president "illegally acted" by deploying the National Guard for the L.A. protests.

• The White House has blamed Newsom directly "for the lawless riots and violent attacks on law enforcement in Los Angeles."

Go deeper: Trump-Newsom feud boils over during immigration protests in LA

Editor's note: This is a breaking news story. Please check back for updates.