Kentucky U.S. Rep. Thomas Massie lost his Republican House primary Tuesday in another test of U.S. President Donald Trump's power over his party after he handpicked challenger and ultimate winner Ed Gallrein to oust the incumbent.

Trump calls Thomas Massie a "Weak and Pathetic RINO" and backs Ed Gallrein in a heated Kentucky GOP primary clash.

Thomas Massie is really locking horns with President Donald Trump in Tuesday’s Republican primary.