GOP senator: McMaster has been 'legendary'
09:40Sen. Tom Cotton, R-Ark., discusses Donald Trump's naming of Lt. Gen. H. R. McMaster as the new national security adviser to replace Michael Flynn and if there's a Trump foreign policy doctrine.
Sen. Tom Cotton, R-Ark., discusses Donald Trump's naming of Lt. Gen. H. R. McMaster as the new national security adviser to replace Michael Flynn and if there's a Trump foreign policy doctrine.