A Republican senator who was slammed by Trump after opposing his bill won't seek reelection. Another said the bill is testing the "soul" of the GOP.

But state and local lawmakers and AI safety advocates argued that the rule is a gift to an industry that wants to avoid accountability for its products. Led by Arkansas Gov. Sarah Huckabee Sanders, a majority of GOP governors sent a letter to Congress opposing it.

U.S. Republican Sen. Thom Tillis of North Carolina announced he will not be seeking reelection, just a day after voting against advancing President Trump's massive policy bill.