Sen. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) said he hoped that Senate Republicans would stand up to 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 amid simmering disagreements over his decision to place tariffs on Mexico.

“Hopefully this is the break point where Senate Republicans show some wisdom and slow down our president’s endless swinging of the club of tariffs and hitting some of our closest allies,” Coons, who sits on the Senate Foreign Relations Committee, said on CNN Wednesday morning.

Trump announced Thursday that a 5 percent tariff would be implemented on all imports from Mexico starting next week and that it could be steadily hiked to 25 percent if the White House is dissatisfied with efforts by Mexico City to curb illegal border crossings.

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The announcement irked Senate Republicans, who have long placed high value on free trade, especially with America’s neighbors. Some members warned the White House against the plan during a meeting behind closed doors Tuesday.

Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas), who attended the meeting, told reporters “there was deep concern expressed in the lunch about the prospects of tariffs with Mexico.”

“I think it's fair to say … that every senator who spoke, and there were probably a half-dozen, generally had the same point of view. Nobody was supportive, who spoke,” added a second GOP lawmaker.

Some Republican lawmakers in the House and Senate are mulling a disapproval resolution, though there is skepticism that it will be brought up on the Senate floor. Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) told reporters Tuesday that “we’re hoping that doesn’t happen.”

Coons appeared to wonder how strongly Republicans would rebuke Trump on the tariffs, citing the party’s mostly consistent loyalty to the White House since the administration took power in 2017.

“This is a Republican caucus that tends to fall in line even when they have good reason to have profound misgivings about the president’s abrupt decisions,” he said.