McMaster, who spent more than three decades in the U.S. Army, is a 1984 graduate of West Point with a doctorate from the University of North Carolina at Chapel Hill in American history, according to a White House announcement on his appointment.
Several reports on Thursday floated potential replacements for McMaster, including Stephen Biegun, the vice president of worldwide governmental affairs at Ford Motor Company; Safra Catz, Oracle's co-CEO; and John Bolton, the former USA ambassador to the United Nations.
As for talk of a White House in upheaval, Sanders pointed out the tax cuts passed late a year ago: "If they want to call it chaos, fine, but we call it success and productivity and we're going to keep plugging along".
McMaster said at the time he was honored to serve the president.
The NBC report cited five sources familiar with discussions, claiming the White House is preparing for McMaster's departure as early as next month.
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Biegun, who now serves as vice president of global governmental affairs for the Ford Motor Company, is no stranger to the White House.
President Donald Trump's White House continues to be beleaguered with staffing issues as reports that National Security Adviser HR McMaster may also leave have surfaced in the wake of trusted adviser Hope Hicks' departure. According to NBC it was Rice herself who introduced Biegun to Mattis, getting his foot in the door.
After General McMaster left the room, Mr. Mattis and Mr. Tillerson continued to speak, not realizing that other participants were still on the line.
Mr McMaster's comment sparked a Twitter response from the President. Four senior administration officials told Reuters on the condition of anonymity that both Kelly and McMaster might resign at any time.