June 2 (UPI) -- Just days before the U.S. Senate was set to hold a confirmation vote, President Donald Trump withdrew Jared Isaacman's nomination for NASA administrator, citing "prior associations."

While the White House did not reveal specifics about why the nomination was being pulled, spokesperson Liz Huston confirmed Monday that the administration is looking for a new candidate to lead the agency.

"The administrator of NASA will help lead humanity into space and execute President Trump's bold mission of planting the American flag on the planet Mars," Huston said. "It's essential that the next leader of NASA is in complete alignment with President Trump's America First agenda and a replacement will be announced directly by President Trump soon."

On Saturday, Trump revealed in a

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