Three sources are confirming to NBC News that National Security Advisor Mike Waltz and Deputy National Security Advisor Alex Wong are both expected to leave the Trump administration. NBC News' Yamiche Alcindor reports more. Former CIA officer Marc Polymeropoulos and Mark McKinnon, former advisor to President George W. Bush, join Chris Jansing to react. For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/ » Subscribe to MSNBC: https://www.