MSNBC's Ari Melber hosts "The Beat" on Tuesday, September 20 and reports on Donald Trump's legal team meeting with the DOJ in court before the newly appointed special master. Plus, MSNBC's Chief Legal Correspondent Ari Melber previews a forthcoming key January 6 report featuring a new forward by Melber. John Flannery, Chai Komanduri and Dave Aronberg join.
