Ruben Gallego

The Senate Ethics Committee has dismissed allegations that Senator Ruben Gallego, Democrat of Arizona, engaged in sexual misconduct and violated campaign finance laws, after an investigation prompted by a complaint from a Republican congresswoman.

In a private letter dated June 26, which Mr. Gallego blasted out in a news release on Monday, the bipartisan ethics panel wrote that it “did not find evidence that your actions violated federal law, Senate rules or related standards of conduct.”

The committee said it had reviewed statements by individuals identified in the complaint, as well as campaign finance reports, expenditure reports from the clerk of the House of Representatives and other documents.

Representative Anna Paulina Luna, Republican of Florida, first made accusations against Mr. Gallego, who is mulling a run for president in 2028, in an April interview with CBS News.

Ms. Luna had played a key role in forcing the resignations of two House lawmakers, one Republican and one Democrat, accused of sexual misconduct, and was on the warpath to rid Congress of other harassers.

She claimed she knew of a woman who was going to come forward and publicly disclose a sexual incident involving Mr. Gallego. Ms. Luna said that Senator John Thune, Republican of South Dakota and the majority leader, had assured her the matter would be investigated.

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