Donald Trump wants to countersue a former “Apprentice” contestant who accused him of defaming her when he denied her sexual assault allegations.Saying that Trump is being harassed to keep him from speaking freely, his lawyer asked a court's permission Monday to pursue a counterclaim against Summer Zervos.The request comes as Zervos' nearly five-year-old defamation suit is nearing an important phase. Both he and she are due to undergo questioning under oath by Dec.