John Michael Katko (; born November 9, 1962) is an American attorney and politician who served as the U.S. representative for New York's 24th congressional district, based in Syracuse, from 2015 to 2023. A member of the Republican Party, he previously was an Assistant United States Attorney who led the organized crime division at the U.S. Attorney's Office in Syracuse. In that role, he helped to prosecute gang members under the Racketeer Influenced and Corrupt Organizations Act.In the 116th Congress, he was a co-chair of the House moderate Republican faction, the Tuesday Group. He was the sole chair of the renamed Republican Governance Group for the 117th Congress. Katko was one of ten House Republicans who voted to impeach then-President Donald Trump during Trump's second impeachment.On January 14, 2022, Katko announced that he would not seek reelection in 2022. In January 2023, he was named a senior advisor for the Washington, DC-based lobbying and consulting firm Hill East Group.