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According to this report in the Washington Compost the president has made a decision to remove McMaster but has not yet taken the action to do so.

Trump decides to remove national security adviser, and others may follow
By Ashley Parker, Josh Dawsey, Philip Rucker and Carol D. Leonnig
March 15 at 8:51 PM E
President Trump has decided to remove H.R. McMaster as his national security adviser and is actively discussing potential replacements, according to five people with knowledge of the plans, preparing to deliver yet another jolt to the senior ranks of his administration.
Trump is now comfortable with ousting McMaster, with whom he never personally gelled, but is willing to take time executing the move because he wants to ensure both that the three-star Army general is not humiliated and that there is a strong successor lined up, these people said.