President Donald Trump on Thursday rejected any suggestion that a private U.S. oil executive is shaping Washington’s approach to Venezuela, stepping into a sensitive debate over who gets influence in the future of the world’s largest stranded crude reserves. In a post on Truth Social, Trump said Florida fuel trader Harry Sargeant III has no authority to act on behalf of the United States and that only State Department-approved officials conduct diplomacy with Caracas. He described current relations with Venezuela as strong and credited…