President Trump announced Tuesday he has decided to nominate Jared Isaacman to serve as his NASA administrator, months after withdrawing the tech billionaire's nomination because of concerns about his political leanings. Trump announced in late May that he had decided to withdraw Isaacman after a "thorough review" of his "prior associations," the AP reports. Weeks after the withdrawal, Trump went further in expressing his concerns about Isaacman's Republican credentials. He acknowledged that he thought Isaacman "was very good," but had become "surprised to learn" that Isaacman was a "blue blooded Democrat, who had never contributed to a Republican before."