Republican Rep. Adam Kinzinger Adam Daniel KinzingerFox News reporter defends confirming Atlantic piece despite Trump backlash: 'I feel very confident' GOP lawmaker defends Fox reporter after Trump calls for her firing Lindsey Graham: 'QAnon is bats--- crazy' MORE (Ill.) on Monday doubled down on his criticism of President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's decision to pull U.S. troops from Syria after Trump pledged there would be "strong sanctions" for Turkey.

"I just.... i mean.... what?" Kinzinger tweeted. "@realDonaldTrump I thought you were going to defeat ISIS, that is why people voted for you. What changed?"

"This is weakness. America is far more honorable than this," he added.

I just.... i mean.... what? @realDonaldTrump I thought you were going to defeat ISIS, that is why people voted for you. What changed? This is weakness. America is far more honorable than this. https://t.co/N5IqSKqSTC — Adam Kinzinger (@RepKinzinger) October 14, 2019

Trump on Monday said that "big sanctions" on Turkey are coming after its military launched an offensive in Northern Syria.

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"Big sanctions on Turkey coming! Do people really think we should go to war with NATO Member Turkey? Never ending wars will end!" he tweeted.

He also suggested that the Syrian Kurds targeted by Ankara may be releasing some ISIS prisoners to get the U.S. involved in the conflict.

The Turkish military offensive followed a White House announcement last week that U.S. troops would not be "in the immediate area."

Trump's withdrawal of U.S. forces sparked bipartisan criticism, as lawmakers said it threatened U.S. security and allies.

Kinzinger on Sunday said that troops who were stationed at the Turkey-Syria border would have prevented the advancement of Turkish forces.

“We all know that if there were still those ... soldiers, Turkey wouldn’t attack,” he said in an interview with CBS’s “Face the Nation.”

“To see this yet again, leaving an ally behind, abandoning people that we told that we were going to be with is disheartening, depressing, frankly it’s weak,” he added. “I don’t see how it follows through on the president’s biggest promise in the campaign to defeat ISIS, because I think it’s going to resurge.”

The New York Times has reported that ISIS has claimed responsibility for at least two attacks since the fighting began last week.

A Kurdish leader previously said in an op-ed that the U.S. had "betrayed" the Kurds and that forces guarding ISIS prisoners would need to be "redirected" to combat the Turkish military.