Amash not ruling out presidential run

Rep. Justin AmashJustin AmashAmash: 'Bolton never should have been hired' Romney: Bolton firing 'a huge loss' for nation Amash says Sanford presidential bid won't impact decision on whether he runs in 2020 MORE (Mich.), a vocal critic of President TrumpDonald John TrumpSupreme Court comes to Trump's aid on immigration Trump is failing on trade policy Trump holds call with Netanyahu to discuss possible US-Israel defense treaty MORE who left the GOP last week, said Sunday he's not ruling out a presidential run. 

Amash told Jake TapperJacob (Jake) Paul TapperCNN, NY Times to host next Democratic debate in October Saagar Enjeti rips Harris over response to questioner's mental disability remark Pompeo says canceled Taliban meeting was attempt at peace, Democrats attack 'bizarre' plan MORE on CNN's "State of the Union" he would consider running as an independent. 

"I still wouldn't rule anything like that out. I believe that I have to use my skills, my public influence, where it serves the country best. And I believe I have to defend the Constitution in whichever way works best," he said.

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Amash announced in a Washington Post op-ed Thursday that he was leaving the Republican Party.

He had been the only member of the GOP to call for impeachment proceedings against President Trump. 

In his op-ed, Amash did not specifically call out Trump.

He told CNN on Sunday that he has had concerns with the Republican Party for several years and that "this term in Congress has really shown how bad it can get." 

Amash said he plans to run for reelection to his congressional seat and is "very confident" he will win despite leaving the party. 

He faces a Republican challenger, Jim Lowe.