A Republican lawmaker is preparing a legislative challenge to President Donald Trump’s agreement with Russia on diesel supplies, arguing for restrictions on Russian oil purchases. Rep. Brian Fitzpatrick of Pennsylvania announced Saturday that he intends to force a House vote, potentially putting him at odds with the president.

The dispute centers on competing priorities: reducing energy costs and preventing Moscow from benefiting financially while its war against Ukraine continues.

Fitzpatrick, who co-chairs the Congressional Ukraine Caucus, plans to introduce a proposal titled the “Ronald Reagan Peace Through Strength Act.” He aims to advance the bill through a discharge petition, a procedure that can bring legislation to the House floor without approval from congressional leadership.

“It will be forced to the Floor via discharge and it will pass overwhelmingly,” Fitzpatrick wrote on X.

Rep. Don Bacon of Nebraska, who is leaving Congress, has also indicated his support. He told Axios he has “already agreed” to sign the petition.

The controversy follows Trump’s announcement Friday that Russia would begin supplying more than 300,000 tons of diesel to the United States and international markets, with further deliveries planned. The administration has promoted the arrangement as a potential way to ease fuel costs, but energy analysts doubt the additional supply will have a substantial effect on prices.

Ukrainian President Volodymyr Zelensky has sharply criticized the agreement. He described it as “not fair and not honest” and told Axios that the arrangement effectively benefits Russian President Vladimir Putin.

Trump added to the tensions Saturday by urging Ukraine to replace Zelensky with a leader willing to reach an agreement with Moscow.

The White House had not provided a response to Axios’ request for comment on Fitzpatrick’s proposed legislation.

The initiative also highlights divisions within the Republican Party as lawmakers face the approaching midterm elections. Fitzpatrick joins a growing number of Republicans willing to challenge Trump publicly, at a time when the party is working to preserve its congressional majority amid declining approval of the president.

Fitzpatrick’s strategy relies on a procedural tool that lawmakers have increasingly used to bypass House Speaker Mike Johnson of Louisiana. A discharge petition needs 218 signatures to bring a bill to the floor without leadership’s authorization.

Fitzpatrick and Bacon previously worked to force a House vote on Ukraine aid and Russia-related sanctions. That measure passed the House but failed to advance in the Senate.

The latest effort faces a difficult timetable. The current Congress is due to end in January, and the House is not scheduled to return to voting until after the November 3 midterm elections. Any proposal that passes the House would still have to clear the Senate and could face a presidential veto.

Support for the petition remains uncertain on both sides of the aisle. One Republican lawmaker, speaking anonymously to Axios, questioned whether colleagues should commit to the effort so far in advance.

“Being that Congress won’t be in session for another four weeks, any prudent lawmaker would probably not make a commitment to this prematurely.”

A Democratic House member told Axios that they intend to sign the petition and expect “most” fellow Democrats to support it. However, the lawmaker cautioned that party-wide agreement is not certain.

“Leadership may not want people to help him,” the Democrat said, adding that political calculations could shift after the midterm elections.