Sen. King: In Senate trial, need to answer questions on what Trump knew and what he did

Senator Angus King (I-ME) joins Andrea Mitchell to discuss the upcoming impeachment trial in the Senate. When asked how he'll vote, he says, "I think there are some questions we need to really have a totally clear picture of this. One is what intelligence did he have that morning or the day before as to the nature of the crowd," before adding, "the second question is what did he do that afternoon when it was going on?"