Anderson Cooper 360

Senators wrap up first day of impeachment trial questions; Senators question House Managers and Trump lawyers; White House threatens to block publication of Bolton's book; Trump lawyer says he can't say when the President first discussed Bidens and Ukraine; White House threatens to block publication of Bolton's book; Bolton's lawyer: book does not contain classified info; Trump attorney Dershowitz argues a President trying to win reelection with a quid pro quo is acting in the national interesting, can't be impeached; Trump lawyer says he can't say when the President first discussed Bidens and Ukraine; Parnas goes to Washington; Lev Parnas: Those blocking my testimony are "scared" via Knit