Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), chairman of the Senate Foreign Relations Committee, said Wednesday that a planned meeting with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE was abruptly canceled amid growing questions over the administration's decision to pull out of Syria.

“It was to be a meeting, we've obviously had an interesting relationship over the course of the last couple of years, really two and a half, and it was really just a meeting to go by and say hello. It had evolved though into a meeting that was going to be about Syria, let's face it. And so it just ended up, they ended up canceling the meeting,” he told reporters, confirming that he was already at the White House when he learned of the cancellation.

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Corker and Trump have had an acrimonious relationship since Trump took the White House. The Tennessee Republican has criticized the president’s policies and method of governance, saying this week, “What is happening right now is not the standard Republicanism that we've had in our country for many, many years and it's very different.”

The criticism has earned Corker, who is 5 feet, 7 inches tall, the Trump nickname “Liddle' Bob Corker.”

Corker was critical of the White House’s announcement Wednesday that it planned to withdraw U.S. troops from Syria.

“It’s hard to imagine that any president would wake up and make this kind of decision with this little communication, with this little preparation,” he said. “I think the Russians already sent out a statement saying it was great. Iranians think it’s great. Syrians think it’s great. I don’t think you see any statements from our friends and allies who think this is great.”

Russia and the U.S. have been supporting opposing sides in the Syrian civil war, with Russia and Iran supporting the government of Bashar Assad and the U.S. backing various rebel forces, which both oppose the government and fight the Islamic State in Iraq and Syria (ISIS).

Russian Foreign Ministry spokesperson Maria Zakharova on Wednesday praised the withdrawal as an opening for “a political solution.”

Trump announced Wednesday morning that ISIS had been beaten in Syria, accomplishing “my only reason for being there.”

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 (R-Ill.), an Air Force veteran, responded by saying “This is simply not true.”

This is simply not true. https://t.co/Jvie2NxgWz — Adam Kinzinger (@RepKinzinger) December 19, 2018

The White House confirmed in a statement Wednesday after Trump’s tweet that the administration has “started returning United States troops home” but emphasized that coalition efforts in Syria would continue. It also reiterated Trump's claim that “the United States has defeated the territorial caliphate.”

“We have started returning United States troops home as we transition to the next phase of this campaign," her statement said. "The United States and our allies stand ready to re-engage at all levels to defend American interests whenever necessary, and we will continue to work together to deny radical Islamist terrorists territory, funding, support, and any means of infiltrating our borders.”