A U.S. congressman who is leaving the Republican Party said on Sunday that President Donald Trump's personal attacks against critics intimidate others in the party from speaking out against him, but said, "It doesn't scare me."

Rep. Justin Amash, who quit the party www.reuters.com/article/us-usa-congress-amash/trump-critic-amash-quits-their-republican-party-idUSKCN1TZ16Y last week, told CNN that Republican lawmakers fear being singled out by fellow Republican Trump for personal, nasty attacks and that keeps them silent about Trump's conduct.

"It's a big part of it. They're afraid they'll be attacked," Amash said on CNN's "State of the Union" program.