Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) is urging President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE to "pull back from the brink" from an international fight over tariffs, warning they could start a "trade war."

"I don't think anything good will come out of a trade war, and I hope we pull back from the brink here," McConnell said at the Greater Louisville Inc.'s Congressional Summit in Kentucky on Friday, according to the local business journal.

"These tariffs will not be good for the economy, and I worry that it will slow, or impede significantly, the progress we're making economically," McConnell added.

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The Republican leader's comments are the latest sign of GOP backlash after the Trump administration announced Thursday that it would make good on a threat to slap steel and aluminum tariffs on the European Union, Mexico and Canada, ending an exemption for the key trading allies.

McConnell has repeatedly warned the administration against such trade moves, particularly over concerns that steep tariffs could roil the economy and spark retaliation from other countries.

"It won't surprise you to know that I'm among those not happy about the prospect of a trade war," the Senate GOP leader said Friday.

McConnell is one of several GOP lawmakers who have spoken out against Trump's tariff decision.

"I disagree with this decision," Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) said Thursday.

Meanwhile, GOP Sen. Ben Sasse Benjamin (Ben) Eric SasseGovernment watchdog recommends creation of White House cyber director position Chamber of Commerce endorses McSally for reelection Ben Sasse is mistaken with idea for the election of senators in America MORE (Neb.) has called the move "dumb"; Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah), the chairman of the Senate Finance Committee, said the tariffs are a "tax hike" and GOP Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (Tenn.) argued Trump was abusing his authority to impose tariffs tied to national security.

Republicans have also been up front about the fact that they are worried Trump's trade moves could roil the economy months before a midterm election, undoing what they view as a boost from last year's tax bill.

GOP Sen. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (Pa.) announced on Friday that he would support legislation by Sen. 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 (R-Utah) that would boost congressional oversight on Trump's tariff decisions.

But McConnell on Friday downplayed the chances that Congress would ultimately pass a bill reining in Trump's trade powers.

The Senate GOP leader said there was "not much" lawmakers could do, noting any legislation would have to be signed by the president or have enough support to overcome a veto.

“Under the trade law, the president has pretty much all the ability to do these things, so there’s not much we can do to impact it. It’s really an executive branch activity. ... It’s just that I think many of us feel that it shouldn’t be done," McConnell told Insider Louisville.

—Updated at 5:31 p.m.