President Donald Trump is backing efforts to defeat U.S. Representative Thomas Massie in Kentucky’s Republican congressional primary, according to multiple outlets. The contest has attracted exceptionally high spending and is described as the most expensive U.S. House primary in history, with tens of millions of dollars spent on political advertising. Coverage highlights that the race is seen as a test of Trump’s influence within the Republican Party, particularly over lawmakers who are critical of him. Several reports frame the primary as part of a broader pattern in which Trump seeks to unseat prominent internal critics, noting that he recently pushed out a key critic in Louisiana. While the Kentucky primary centers on Massie’s re-election bid, it is also presented as one of several major contests occurring on Tuesday that will indicate how much power big donors and outside groups bring to federal primaries. Overall, sources agree the race’s scale in fundraising and advertising is central to the story, alongside Trump’s direct involvement and the political significance attributed to Massie’s standing with the party’s base.