Armed man who attacked F.B.I. office called for violence after Mar-a-Lago search

Ben Collins, NBC News senior reporter, shares what is known about a man who attacked a local FBI field office. Identified by law enforcement sources as Ricky Shiffer, he was at the riot at the Capitol on January 6th, and appears to have been active in Trump-supporting social media, posting violent messages, including against the F.B.I. in the wake of the search of Mar-a-Lago.