Some Republican lawmakers mentioned this legislation as they criticized the diesel plan. “The President should be using those authorities instead of allowing Russia to export diesel, rake in revenues, and continue its catastrophic war in Ukraine,” said Murkowski.

“I oppose President Trump’s decision to lift sanctions on the purchase of diesel from Russia,” said Collins. “I was a co-sponsor of the Russian sanctions law, which the President recently signed, but is now not following.”

TIME has reached out to the White House for comment.

Republican Rep. Brian Fitzpatrick of Pennsylvania announced Saturday he plans to introduce a bipartisan bill intended to stop Trump from lifting sanctions on Russian oil.

“We will be introducing bipartisan legislation to block any and all purchases of Russian oil. It will be called the ‘Ronald Reagan Peace Through Strength Act,’” said Fitzpatrick. 

Rep. Don Bacon of Nebraska, a Republican who has clashed with Trump on other high-profile issues, said he has already agreed to be a co-sponsor of the bill, insisting that “Congress must make a stand.”