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 is hitting back at Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) over his opposition to plans to withdraw all U.S. troops from Syria.

“So hard to believe that Lindsey Graham would be against saving soldier lives & billions of $$$. Why are we fighting for our enemy, Syria, by staying & killing ISIS for them, Russia, Iran & other locals? Time to focus on our Country & bring our youth back home where they belong!” Trump tweeted Thursday.

So hard to believe that Lindsey Graham would be against saving soldier lives & billions of $$$. Why are we fighting for our enemy, Syria, by staying & killing ISIS for them, Russia, Iran & other locals? Time to focus on our Country & bring our youth back home where they belong! — Donald J. Trump (@realDonaldTrump) December 20, 2018

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Trump on Wednesday declared victory over the Islamic State in Iraq and Syria (ISIS) and the White House announced that it would begin withdrawing troops from Syria.

“We have defeated ISIS in Syria, my only reason for being there during the Trump Presidency,” Trump tweeted Wednesday morning.

We have defeated ISIS in Syria, my only reason for being there during the Trump Presidency. — Donald J. Trump (@realDonaldTrump) December 19, 2018

The announcement was met with shock in Washington, where it caught lawmakers and the Pentagon off guard. Lawmakers from both parties criticized the move, including Graham who called it a plan for "chaos" and an "Obama-like mistake."

“I give the president all the credit in the world for changing their policies regarding the fight against ISIS, but I will not buy into the narrative that they have been defeated,” Graham said in a Wednesday evening address.

“To say they're defeated is an overstatement and is fake news,” he added. “It is not true. They have been severely damaged, but they will come back unless we're there to stop them.”

Graham, who sits on the Senate Armed Services Committee, ran against Trump in 2016 for the GOP nomination. But since then has become a staunch defender of the president.

Graham said Thursday that he plans to introduce a resolution that calls on Trump to reverse plans for the withdrawal. Graham said he hopes for a vote before the end of the year.

In a bipartisan letter to Trump with other senators, Graham said leaving Syria would give ISIS new life.

“If you decide to follow through with your decision to pull our troops out of Syria, any remnants of ISIS in Syria will surely renew and embolden their efforts in the region,” they wrote.

“As you are aware, both Iran and Russia have used the Syrian conflict as a stage to magnify their influence in the region," the senators wrote. "Any sign of weakness perceived by Iran or Russia will only result in their increased presence in the region and a decrease in the trust of our partners and allies,” they added.

Trump has defended his decision, including by invoking the memory of service members who died fighting in Syria.

“They're all coming back and they're coming back now. We won, and that's the way we want it and that's the way they want it,” Trump said while looking up and pointing to the sky in a video posted to Twitter.

Trump on Wednesday declared victory over ISIS. But on Thursday he said the U.S. withdrawal would shift the burden for fighting the group onto Russia and Iran.

Updated at 2:55 p.m.