CAPE CANAVERAL, Fla. (AP) — Billionaire spacewalker Jared Isaacman urged senators on Wednesday to take swift action on his bid to lead NASA , after being yanked and then renominated by President Donald Trump.

Isaacman appeared before the Commerce, Science and Transportation Committee in Washington eight months after his first nomination hearing . The tech entrepreneur who's rocketed into orbit twice with SpaceX stressed the need for “full-time leadership” at NASA as the space agency prepares to send astronauts back to the moon early next year.

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