Former President Donald Trump’s campaign rivals should answer whether they agree with his attorney John Sauer’s argument in the D.C. Court of Appeals that the former president couldn’t have been prosecuted even for ordering the military assassination of a political opponent, as long as he was not impeached over the offense, argued former Republican Party chair Michael Steele on MSNBC Wednesday — because the obvious logical extension of this argument is that President Joe Biden couldn’t be prosecuted for having Trump killed either. This comes as Chris Christie, the only Republican presidential …