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Donald TrumpDonald John TrumpAccuser says Trump should be afraid of the truth Woman behind pro-Trump Facebook page denies being influenced by Russians Shulkin says he has White House approval to root out 'subversion' at VA MORE and David Axelrod, who stand on opposite sides politically and seem to share a personal enmity as well, tweet at or about each other regularly.

On Wednesday night in an interview with Current TV, Axelrod described Trump as a making "a fool out of himself" this week on a west coast fundraising tour with Mitt Romney. 

Thursday, Trump tweeted his opinion of Axelrod, writing that he is "on a fool's errand" stumping for Obama's campaign. The tweet was likely a response to a press event in Boston earlier in the day where Axelrod was forced to shout over pro-Romney protesters.