By Tom Beattie Sports entertainment tycoon Vince McMahon has issued a firm denial in relation to the claims made by an ex-employee at the WWE headquarters after a lawsuit was filed accusing him of ‘sexual abuse’ and ‘sex trafficking’. In the court documents, Janel Grant alleged that the firm’s then-chief executive ‘abused and sexually exploited her’ at the company’s Stamford offices. Among the litany accusations levelled at the former chief executive of the world-leading wrestling promotion was that he had ‘defecated’ on her head. The lawsuit, which has been issued to a federal court in Connec…