Special report: Feared from warzones to Congress, Counsel Jack Smith leads Trump probe

MSNBC's Ari Melber hosts "The Beat" on Tuesday, January 17 and reports on the New Mexico Republican arrested for allegedly targeting Democratic lawmakers in a string of shootings. Plus, a special report on Special Counsel Jack Smith's long career from prosecuting war crimes to now leading probes of Trump. Andrew Weissmann and Michael Steele join.