NBC’s Mitchell: Michael Flynn Resigns as National Security Adviser
MITCHELL: "According to Kristin Welker and one senior official, the NSA, the acting National Security Adviser, is General Keith Kellogg who was the chief of staff. Michael Flynn has resigned. That has also been reported, I should add, by CNN tonight. Kristin Welker reporting that tonight. She's basing that on a senior official telling her. All action pointed to this in the last of couple hours."