National security adviser John Bolton is reportedly attempting to undermine Defense Secretary Jim Mattis by spreading rumors that he is on his way out of the Trump administration.

In what is the latest episode of reported drama in Trump’s inner orbit, the a source told Foreign Policy that Bolton and his deputy Mira Ricardel have the “knives out” for Mattis, with whom they have a dissenting outlook on matters like the Iran deal, North Korea, and Pentagon appointees.