Outspoken general named Trump's top security adviser

U.S. President Donald Trump on Monday named Lieutenant General Herbert Raymond McMaster as his new national security adviser, choosing a military officer known for speaking his mind and challenging his superiors.

McMaster is a highly regarded military tactician and strategic thinker, but his selection surprised some observers who wondered how the officer, whose Army career stalled at times for his questioning of authority, would deal with a White House that has not welcomed criticism.

"He is highly respected by everybody in the military and we're very honored to have him," Trump told reporters in West Palm Beach where he spent the weekend. "He's a man of tremendous talent and tremendous experience."

One subject on which Trump and McMaster could soon differ is Russia. McMaster shares the consensus view among the U.S. national security establishment that Russia is a threat and an antagonist to the United States, while the man whom McMaster is replacing, retired Lieutenant General Michael Flynn, appeared to view it more as a potential geopolitical partner.

Trump in the past has expressed a willingness to engage with Russia more than his predecessor, Barack Obama.