Graham: Syria decision could be 'biggest mistake' of Trump's presidency

Sen. Lindsey GrahamLindsey Olin GrahamGraham throws support behind Trump's Turkey sanctions Hillicon Valley: Warren takes on Facebook over political ads | Zuckerberg defends meetings with conservatives | Civil liberties groups sound alarm over online extremism bill Fury over Trump Syria decision grows MORE (R-S.C.) on Wednesday warned that unless President TrumpDonald John TrumpBusiness school deans call for lifting country-specific visa caps Bolton told ex-Trump aide to call White House lawyers about Ukraine pressure campaign: report Federal prosecutors in New York examining Giuliani business dealings with Ukraine: report MORE reverses course on his decision to pull U.S. troops out of northern Syria, it "will be the biggest mistake of his presidency."

"I hope he's right. I don't think so. I know that every military person has told him don't do this,” Graham said in an appearance on Fox News's “Fox & Friends.”

“So if he follows through with this, it'd be the biggest mistake of his presidency,” Graham continued.

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The often-vocal Trump ally added that "if we pull out, the Kurds are in a world of hurt, and ISIS comes back and President Trump will own it."

Graham's remarks came shortly before Turkish President Recep Tayyip Erdoğan announced that the country's military and a Syrian militia have begun a military operation against Kurdish forces in northern Syria.

Ankara had long threatened to attack the Kurds in Syria but had held off while U.S. troops acted as a buffer. The White House announced on Sunday night that it was yanking U.S. troops from the area.

Trump's decision has faced fierce backlash from both sides of the aisle on Capitol Hill, with lawmakers warning that it will bolster the Islamic State in Iraq and Syria (ISIS) and leave the Kurds vulnerable.

In a string of tweets after the start of the Turkish military operation, Graham said that, if accurate, the move was a "disaster in the making" and that the administration had "shamelessly abandoned" the Kurds, who led the Syrian Democratic Forces that the United States relied on to help fight ISIS.

"If media reports are accurate and Turkey has entered northern Syria — a disaster is in the making," he said. "Pray for our Kurdish allies who have been shamelessly abandoned by the Trump Administration."

Senate Republicans have publicly urged Trump to change his mind about the troop withdrawal. Trump had previously threatened to remove U.S. troops from Syria late last year but ultimately backed down after pressure from the Pentagon and Capitol Hill.

"I urge President Trump to change course while there is still time by going back to the safe zone concept that was working," Graham added on Wednesday.

Lawmakers are warning that they could push back legislatively on Trump's decision. Graham is threatening to slap sanctions on Turkey and author a resolution opposing the president's decision.

Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerTrump defends 'crime buster' Giuliani amid reported probe Louisiana voters head to the polls in governor's race as Trump urges GOP support Trump urges Louisiana voters to back GOP in governor's race then 'enjoy the game' MORE (D-N.Y) told a New York publication this week that he anticipated legislation given the pushback.

"It is getting broad condemnation from Democrats and Republicans and I expect Congress will take some form of action, either a resolution or something else," he said