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According to inside accounts, the president and McMaster clashed when the top aide's cerebral briefings crashed into Trump's more freewheeling style.
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President Trump publicly chastised McMaster last month, after he said that "the evidence is now really incontrovertible" that Russia had interfered in the 2016 election.
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The national security adviser broke with what had been Trump's script about the investigation into Russian interference. Trump said McMaster "forgot" to say election results weren't impacted.
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The Silver Star recipient is a three-star Army general known as a military intellectual. The president called him "a man of tremendous talent and tremendous experience."