For too long, Congress has delegated its clear authority to regulate interstate and foreign commerce to the executive branch," Grassley said.

Sen. Mitch McConnell, R-Ky., denounced tariffs as “bad policy” and “a tax on everyday working Americans,” becoming the latest Republican to break with President Donald Trump’s trade policies a day after he introduced a sweeping tariff package that sent stocks nosediving and threatened to drive up prices for a long list of consumer goods.

Republicans in Congress are watching with unease as stock markets tumble in the aftermath of President Donald Trump’s sweeping tariffs.

Republican Sen. Chuck Grassley (Iowa) crossed party lines and teamed up with Democratic Sen. Maria Cantwell (Wash.) to introduce new legislation Thursday that would pare back President Trump’s tariff authority as GOP unease grows.

It remains unknown whether Oklahoma's Republican U.S. senators will join other Republicans in backing a bipartisan tariffs bill.

Republican U.S. Senator Chuck Grassley introduced a bill on Thursday that would require congressional approval for new tariffs, the day after President Donald Trump unveiled sweeping new taxes on a vast array of imported goods.

A U.S. Senate bill that would require congressional approval for new tariffs gained more Republican support on Friday, on the second day of a stock market rout sparked by President Donald Trump's move to impose sweeping new taxes on imports.