President Trump's political operation has launched an aggressive effort to unseat Kentucky Rep. Thomas Massie, its first such effort to defeat a sitting Republican incumbent, Axios has learned. Why it matters: By going after Massie, Trump's team is looking to put wayward Republicans on notice that they're ready to play hardball. Massie has attacked Trump over his strike on Iran, saying on X that it was "not Constitutional," prompting the president to fire back on Truth Social that the congressman is "not MAGA." He also called Massie "weak, ineffective" and "disrespectful to our great military, and all that they stand...