President Trump endorsed Rep. Andy Barr in Kentucky's GOP primary to replace retiring Sen. Mitch McConnell. Trump called Barr a "100% solid American Patriot" in a Truth Social post, backing the leading candidate in the race. Barr entered the primary last April to compete for McConnell's seat. The endorsement carries weight in Republican primaries, where Trump's backing often determines outcomes among GOP voters. McConnell announced his retirement after 18 terms representing Kentucky, creating an open seat contest. Multiple Republicans compete for the nomination. Barr's congressional experience and Trump's endorsement position him as the frontrunner, though other candidates remain in the field. The primary will determine who advances to the general election in a reliably Republican state where the GOP nominee holds a strong advantage in November.