According to a senior White House aide, Trump once interrupted McMaster during a lengthy policy briefing to roast his adviser: "Look at this guy; he's so serious!"
Officials inside the West Wing told CNN that the preference would be for Mr. McMaster to leave for something that qualifies as a promotion, but some at the Pentagon said he's become too political to serve in the military in a major role.
Some say Trump might force McMaster to retire.
The decision was also driven by the White House's challenge attracting top talent for jobs in the administration due to Trump's "blacklist" of individuals who have criticized the President, his personality and the Russian Federation investigation, according to a senior Republican source. This comes in the wake of his comments at a security conference that there is no longer any doubt that the Russians interfered in the 2016 presidential election. As CNN reports, tensions have escalated between Trump and General H.R. McMaster, the president's primary liaison to the National Security Council, after months of friction between the two. Of course, Trump doesn't necessarily have the grounds to just outright boot McMaster from his appointed position, as the source of his ire is simply a longstanding series of policy (and personality) disagreements - as opposed to any wrongdoing akin to Flynn's various omissions. "Remember the Dirty Dossier, Uranium, Speeches, Emails and the Podesta Company!"
"McMaster, meanwhile, is the person who delivers the news that Trump doesn't want to hear on a daily basis", CNN reported. There was no sense that Kushner would be leaving his job.
Both H.R. McMaster and John Kelly are military men considered by USA political observers as moderating influences on the president by imposing a routine on the White House.
However, all the officials were quick to add that the tensions could blow over, at least for now, as have previous episodes of discord between the president and other top officials.
Officials in the Defense Department said there have been discussions about him returning to the Army, possibly as head of the Forces Command at Fort Bragg, in North Carolina.
But officials told CNN that the White House's wish is to find McMaster a four-star job that is seen as acknowledging his service.