Co-chairs of the committee investigating the January 6 Capitol riot are demanding Pentagon records related to recent reports that Chairman of the Joint Chiefs of Staff Mark Milley went behind then-President Donald Trump 's back to warn China of a potential attack. 'The facts surrounding steps taken at the Pentagon to protect our security both before and after January 6th are a crucial area of focus,' Representatives Bennie Thompson, a Democrat, and Liz Cheney, a Republican, wrote in a statement Thursday. 'Indeed, the Select Committee has sought records specifically related to these matters and we expect the Department of Defense…