General H.R. McMaster, who served as national security adviser to former President Trump, says that the Defense Department "has to be ready" for possible war with China, backing a memo from Air Force Gen. Mike Minihan warning the U.S. and China could be at war within the next two years. McMaster, who is also a CBS News foreign policy and national security contributor, joins CBS News' Anne-Marie Green and Errol Barnett to discuss.
