WASHINGTON (AP) — 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.

The individual was not authorized to comment publicly. The White House and NASA did not immediately respond to emailed requests for comment.

Trump announced last December during the presidential transition that he had chosen Isaacman to be the space agency’s next administrator.

Isaacman is the CEO and founder of Shift4, a credit card processing company. He also bought a series of spaceflights from SpaceX and conducted the first private spacewalk.

Isaacman testified at his Senate confirmation hearing on April 9 and a vote to send his nomination to the full Senate was expected soon.

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