Appearing on MSNBC on Sunday morning, former Rep. Denver Riggleman (R-VA) cited yet another Donald Trump goof-up in a speech on Saturday night to point out that he has been in a mental decline for some time. Speaking with the hosts of “The Weekend,” Riggleman was asked about a report from CNBC that the former president stunned and baffled a collection of CEO’s at a closed-door meeting last week, with insiders saying Trump was “meandering” and “couldn’t keep a straight thought.” According to Riggleman, that should have come as no surprise. Want more breaking political news? Click for the latest…