A Republican lawmaker moved Monday to impeach US Defense Secretary Pete Hegseth over the war in Iran, setting up a potentially explosive vote in Congress just days after President Donald Trump's party suffered a crushing midterm defeat. Kentucky congressman Thomas Massie introduced eight articles of impeachment accusing Hegseth of illegally waging war without congressional authorization and abusing his powers as Pentagon chief. The Republican-controlled House could vote as early as Wednesday, with some lawmakers from Trump's party signaling that they might join Democrats in supporting the charges. Impeachment would be a humiliating blow for Hegseth and the Trump administration, but would not automatically remove him from office. That would require a trial and conviction by a two-thirds majority in the Senate -- a far higher hurdle, even after Democrats take control of the chamber in January.