General known for sharp questions will be Trump's new top security adviser

WEST PALM BEACH, Fla./WASHINGTON (Reuters) - 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