A conservative columnist is stunned that the scandal threatening former President Donald Trump is not a criminal conviction, lying rhetoric aimed at Haitian immigrants or a riot at the U.S. Capitol that resulted in federal charges. The Bulwark’s Andrew Egger on Friday professed himself shocked that Trump’s Achilles’ heel could be porn site comments about Adolf Hitler, slavery and transgender pornography that an explosive CNN report linked to North Carolina Lt. Gov. Mark Robinson. “It’s a mind-boggling possibility: that after everything that’s happened in the last decade, after all his own into…