It looks H.R. McMaster may be the next high-level staffer to leave the White House. NBC News reports it has five sources that confirm the national security adviser could be out by next month.

It’s been known that McMaster and Donald Trump haven’t seen eye to eye in a long time.  Just two weeks ago McMaster said this about Russian interference in US elections, “As you can see with the FBI indictment, the evidence is now really incontrovertible and available in the public domain.” Of course, there was soon a Trump tweet saying the Russians had no impact on his win.

MSNBC’s Nicole Wallace says there is already a potential replacement being lined up for McMaster. Check out the clip above for more.