A bipartisan group of six senators is urging President Donald Trump to abandon a plan to bring Russian diesel into the United States, arguing the move could violate federal law and send revenue to a government waging war against Ukraine. The senators said Sunday that the administration had neither consulted Congress nor explained how the plan complies with legal requirements. Their statement called on the administration to reverse course, saying the United States should not provide Russian President Vladimir Putin with financial support while Russian forces continue killing Ukrainian civilians. The group includes Republican Sens. Susan Collins of Maine, Lisa Murkowski of Alaska, Thom Tillis of North Carolina and John Curtis of Utah, along with Democratic Sens. Jeanne Shaheen of New Hampshire and Richard Blumenthal of Connecticut. Trump announced Friday that he had reached an agreement with Putin during a phone call. He said Russia would supply more than 300,000 tons of diesel immediately, followed by 500,000 tons in November and 1 million tons after that. He also described a further 3 million tons as arriving within a short period. Congress banned Russian energy imports in 2022 after Russia’s invasion of Ukraine. The six senators said Trump’s decision to allow Russian diesel into the country runs counter to that restriction. They also pointed to legislation passed in recent weeks directing the president to impose substantial tariffs on major importers of Russian oil and natural gas, subject to an exception for countries that import less than 15% of Russia’s natural gas exports and have taken significant steps to reduce those imports. Tillis said Sunday that proceeding with the diesel plan could put the administration on the wrong side of the law. Russia, he said, is the aggressor and could end the war by withdrawing from occupied territory. Sen. John Barrasso, a Republican from Wyoming, defended Trump’s focus on lowering energy costs, saying the president has to weigh difficult choices. Barrasso also urged Trump to enforce the sanctions law passed last month, describing it as leverage to seek a lasting settlement. Whether the shipments could ease prices is also in question. Richard Nephew, a senior research scholar at Columbia University’s Center on Global Energy Policy, said the total volume Trump described appears to be less than U.S. diesel consumption in a single day. He said Russia could gain from weakening the sanctions regime, while the deal may do little to help American consumers. The dispute puts the administration’s effort to address high fuel prices against congressional efforts to restrict Moscow’s energy income, which lawmakers say helps fund Russia’s war against Ukraine.