Seems reasonable to me...he was too busy building skyscrapers in New York to care about some nutcase in the South.
Is this another attempt to smear Trump for what he DIDN’T SAY?
But Trump does know who Duke is. Trump is on record at least twice on 2000 commenting on Duke’s joining the Reforrm Party. Trump specifically said Duke as a bigot, a racist, a member of the KKK, and was bad for the Reform Party.