Former Obama adviser David Axelrod’s concerns about a second Donald Trump administration prompted him to hit back at a Republican insider during a back-and-forth exchange Friday evening that left Axelrod sarcastically remarking, “I actually took civics.” The on-air moment happened on CNN’s “OutFront” after Axelrod expressed his worries amid reports that the Pentagon is preparing for a possible Trump order to deploy troops on Americans. Joining him in the discussion was former Rep. Mondaire Jones (D-NY), who similarly expressed fears about Trump’s threat to terminate the Constitution and surrou…