WASHINGTON — Sen. Thom Tillis said Sunday that President Donald Trump’s latest energy agreement with Russia may violate federal law, as the North Carolina Republican raised concerns about U.S. support for a deal involving Russian oil while Russia’s war in Ukraine continues. “I do believe there’s a legitimate case for saying the president’s not following the law,” Tillis said on NBC’s “Meet the Press.” He said a 2022 law passed by Congress barred Russian oil imports unless specific conditions were met, including Russia’s complete withdrawal from Ukraine. Tillis also warned the agreement could put American lives at risk. He said Russia is the aggressor and “the one who can end this war by backing out of territory they occupied.” He criticized the deal as tarnishing Sen. Lindsey Graham’s legacy. The White House, asked for comment, pointed to a post Trump made on Truth Social declaring an “energy ceasefire” in the Russia-Ukraine war effective immediately. Trump provided no details about the arrangement, and the post offered no evidence that Russia had agreed to it. The president’s announcement followed an interview with Ukrainian President Volodymyr Zelenskyy, who had urged Trump to support an energy ceasefire. The available details did not clarify what the reported agreement would require or how it would interact with the law Tillis cited. Tillis’ comments put a Republican senator’s public challenge to the administration’s Russia policy alongside questions about whether any U.S. action involving Russian oil complies with restrictions enacted by Congress. His remarks were allegations about the agreement’s legality, not a formal legal finding.