The move comes several months after Trump withdrew an initial nomination of Isaacman – an ally of the billionaire Elon Musk – for the same role back in May. Just one week before Isaacman’s confirmation, Trump posted: “After a thorough review of prior associations, I am hereby withdrawing the nomination of Jared Isaacman to head Nasa. I will soon announce a new Nominee who will be mission aligned, and put America first in space.”