GOP Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) is renewing his effort to rein in 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's tariff authority amid an escalating trade war.

Corker, an outspoken critic of Trump who's retiring at the end of this term, has filed an amendment to the Senate's farm bill that would require congressional approval if the president wants to impose tariffs under the national security provisions of the trade law, known as Section 232.

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It's unclear whether the Senate will vote on the amendment authored by Corker, who's chairman of the Foreign Relations Committee. Republicans blocked a similar proposal, backed by a bipartisan coalition, during the chamber's consideration of an annual defense policy bill earlier this month.

Corker's effort this time around comes as the administration's trade policies further strain Trump's relationship with congressional Republicans, who have publicly pleaded with him to back down from his tariffs strategy.

The European Union announced last week that they would slap new tariffs on American products in response to the Trump administration's tariffs on steel and aluminum. A few days later, Harley-Davidson announced it is moving some production overseas to avoid the European tariffs.

Commerce Secretary Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE was grilled about the trade strategy by GOP senators on the Finance Committee during a hearing last week.

Sen. Rob Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (R-Ohio) said on Tuesday that he's asking for the panel to hold a hearing and a vote on legislation that would alter the national security provisions.

"I think we should have a markup of legislation that narrows the scope of 232 to what I think is the original intent," Portman said. "We talked about this last week in the hearing ... and I got some answers from [Ross] on the record that I think are consistent with a markup of a tighter 232. I think its too broad right now."