Senate Republicans joined Democrats in offering a direct rebuke Thursday of the administration’s Syria policy, marking the first time during the new Congress that the GOP caucus has formally broken with President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

Senators voted 68-23 to end debate on an amendment that warns Trump against drawing down troops in Syria and Afghanistan. Senators still need to hold a second vote to add the amendment to the foreign policy bill, which will likely take place next week.

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The vote is the latest sign of fracture between congressional Republicans and Trump on foreign policy. The president caught lawmakers off guard when he announced last month that he would yank troops from Syria. He further rankled Republicans this week when he lashed out at top administration intelligence officials after they publicly contradicted him on Iran.

Sen. Marco Rubio Marco Antonio RubioMurky TikTok deal raises questions about China's role Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic MORE (R-Fla.), who argued that the Senate vote was not a "political issue," said he opposed the administration's policy because "it directly undermines one of the two pillars of our strategy and our policy in the region."

"What I'll say here today is what I said initially about it, my position that I thought it was a bad idea. I said it then. I said it to the president in a subsequent meeting, and I thought it was important to restate it here," Rubio said.

Asked what message the vote Thursday sent, Sen. John Cornyn John CornynTumultuous court battle upends fight for Senate Texas Democrats roll out first wave of planned digital ads as Election Day nears Calls grow for Biden to expand election map in final sprint MORE (R-Texas) said that it showed Congress is a “co-equal branch of government.”

The non-binding amendment, spearheaded by Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellGraham: GOP will confirm Trump's Supreme Court nominee before the election Trump puts Supreme Court fight at center of Ohio rally The Memo: Dems face balancing act on SCOTUS fight MORE (R-Ky.), warns the administration against a “precipitous” withdrawal of the U.S. forces in Syria and Afghanistan.

It also urges the administration to certify that certain conditions have been met “for the enduring defeat of al Qaeda and ISIS before initiating any significant withdrawal of United States forces from Syria or Afghanistan.”

“I’ve been clear about my own views on these subjects,” McConnell said ahead of the vote on Thursday. “I believe the threats remain. [The Islamic State in Iraq and Syria] and al Qaeda have yet to be defeated, and American national security interests require continued commitment to our mission there.”

Foreign policy has been a rolling point of contention between Congress and Trump, who ran with an isolationist worldview that is at odds with most Capitol Hill Republicans.

In 2017, the GOP-controlled Congress approved new Russia sanctions over the objections of the White House. The Senate also passed a resolution last year naming Saudi Crown Prince Muhammed bin Salman as “responsible” for Washington Post contributor Jamal Khashoggi’s slaying, at odds with the administration’s stance.

Sen. Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Idaho), the chairman of the Foreign Relations Committee, characterized the GOP amendment as an example of Congress exerting itself on foreign policy after decades of gradually ceding control to the executive branch.

“This is the way it’s supposed to work. Now, most of the time this is done in the Intelligence Committee and in the Foreign Relations Committee on closed hearings. Occasionally it bubbles over, as it has recently,” Risch said.

He added that Trump’s comments have “properly spawned a debate as to what we’re doing there ... and what we’ve accomplished there.”

GOP support for the resolution wasn’t unanimous. Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.), whose foreign policy views are at odds with many of his GOP colleagues, knocked McConnell ahead of the vote.

“To call it a precipitous withdrawal after 17 years is ludicrous,” Paul said on Fox News. “We’ve been there 17 years.”

Paul missed the vote Thursday, while GOP Sens. Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Murkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight MORE (Texas), John Kennedy John Neely KennedyMORE (La.) and Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) voted against advancing the amendment.

Democrats had initially been split over whether or not to support the amendment. While they have been critical of Trump's logic on pulling troops from Syria, they also voiced concerns that supporting McConnell's amendment could be seen as green lighting military activity in Syria, which Congress has not done.

Sen. Tim Kaine Timothy (Tim) Michael KaineTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick MORE (D-Va.) said shortly before the vote that he expected many Democrats would support McConnell's amendment if they could amend it to make it clear it wasn't authorizing military activities.

Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.) is offering a change to McConnell's proposal that would insert language clarifying that nothing in McConnell's amendment "shall be constructed as a declaration of war or an authorization of the use of military force." Menendez said he believes McConnell is supporting his suggested change.

"I want to make it crystal clear that the McConnell amendment cautioned against a precipitous withdrawal of U.S. troops in no way constitutes sending support for their permanent presence for an undefined mission," he said.

Dozens of Democrats, including Menendez and Kaine, voted to advance McConnell's amendment. But several of the party's 2020 contenders and members of leadership opposed it.

Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.), in a statement after the vote, said U.S. troops had been in Syria under "very questionable legal authorities."

"The American people do not want endless war. It is the job of Congress to responsibly end these military interventions and bring our troops home, not to come up with more reasons to continue them, as this amendment does. That is why I voted against it," he added.

—Updated at 5:41 p.m.