'He will not be afraid to question his boss' - Everything you need to know about Trump's new national security adviser
US President Donald Trump on Monday named Lieutenant General Herbert Raymond McMaster as his new national security adviser. We look at everything you need to know about the man who will advise Trump going forward.
The respected army officer is known for speaking his mind. Pundits have observed that McMaster has a history of challenging his superiors and have questioned whether he and Trump will see eye-to-eye on Russia. McMaster has a view of Russia more in-keeping with US intelligence thinking, while Trump has indicated a willingness to engage with Russia.
His willingness to criticise his superiors has not always worked in his favour in the army, in fact it led to his being passed over for promotion to brigadier general twice, in 2006 and 2007.
A combat veteran, he gained renown in the first Gulf War - and was awarded a Silver Star - after he commanded a small troop of the U.S. 2nd Armored Cavalry Regiment that destroyed a much larger Iraqi Republican Guard force in 1991 in a place called 73 Easting, for its map coordinates, in what many consider the biggest tank battle since World War Two.
McMaster's fame grew after his 1997 book "Dereliction of Duty" criticized the country's military and political leadership for poor leadership during the Vietnam War.
McMaster (54) , is a West Point graduate known as "H.R.," with a Ph.D. in US history from the University of North Carolina at Chapel Hill. He was listed as one of Time magazine's 100 most influential people in 2014, partly because of his willingness to buck the system.
Unlike his short-lived predecessor Michael Flynn, McNaster has no ties to Trump. His appointment has also been welcomed by Democrats and Republicans alike.
Senator John McCain tweeted that he is an "outstanding choice for nat'l security advisor - man of genuine intellect, character & ability".
A former US ambassador to Russia under Obama, Michael McFaul, a Democrat, praised McMaster on Twitter as "terrific" and said McMaster "will not be afraid to question his boss."