David Pecker testifies AMI bought the Karen McDougal story to influence the 2016 election. Also, Trump's immunity case becomes the latest Supreme Court controversy. Plus, the Arizona indictment adds details to the "fake electors" plot. And Tennessee enacts a law allowing teachers to carry guns. Adam Klasfeld, Faith Gay, Ruth Ben-Ghiat, Ryan Reilly, TN State Rep. Justin J. Pearson, and Jennifer Aprea join Ali Velshi.