U.S. teams in North Korea, Singapore try to salvage summit

Key negotiations were underway in North Korea and Singapore to save a summit between President Trump and Kim Jong Un. On Twitter, the president also praised the North, saying it has "brilliant potential and will be a great economic and financial Nation one day." CBS News foreign correspondent Ben Tracy and Gordon Chang, author of "Nuclear Showdown: North Korea Takes on the world," explain the latest developments to CBSN.