A Chinese surveillance balloon that spent time in Canadian and American airspace late last week is sparking a diplomatic crisis. The incident caused U.S. Secretary of State Antony Blinken to postpone his trip to Beijing, and is also raising concerns over national security ahead of U.S. President Joe Biden’s visit to Canada in March. ‘The West Block’ host Mercedes Stephenson sat down with David Cohen, U.S. ambassador to Canada, to discuss the threats China poses.