President Donald Trump has pulled his nomination of Jared Isaacman, a billionaire commercial astronaut with close ties to Elon Musk, as his nominee to serve as administrator of NASA.

President Donald Trump is withdrawing the nomination of tech billionaire Jared Isaacman to lead NASA, a person familiar with the administration's personnel decisions said Saturday.

President Donald Trump faces the challenge of convincing Republican senators, global investors, voters and even Elon Musk that he won’t bury the federal government in debt with his multitrillion-dolla...