MSNBC's Ari Melber hosts "The Beat" on Monday, August 29th and reports on Lindsey Graham threatening riots and unrest if prosecutors indict Donald Trump. Plus Georgia Governor Brian kemp has been ordered to testify in an election probe as the Trump legal team reportedly \u201cscrambles to find an argument\u201d according to the New York Times. DOJ veteran Neal Katyal, law professor Melissa Murray and reporters Joan Walsh and Will Sommer join.