Today's discussions:
Former senior FBI official Chuck Rosenberg, former assistant director at the FBI Frank Figliuzzi, NBC News' Carole Lee and Donny Deutsch on Roger Stone's not guilty plea and Michael Cohen's upcoming congressional testimony;
Former New Jersey governor Chris Christie on why he turned down the Chief of Staff position, overcoming marriage hardships, and what the president thought of his new book;
Former Governor of New Jersey Chris Christie joins Nicolle Wallace to discuss his relationship with the president, the White House staff, and his new book "Let Me Finish"