Billionaire private astronaut Jared Isaacman just finished his second at-bat in his bid for NASA chief.

Isaacman spoke Wednesday (Dec. 3) before the U.S. Senate's Committee on Commerce, Science and Transportation in Washington, D.C., which was holding its second hearing to consider his nomination as NASA administrator.

Isaacman is a private astronaut who has funded and commanded two SpaceX missions to Earth orbit, and was widely considered to be a shoo-in for administrator after his first hearing before the committee on April 9. But on May 31, President Donald Trump abruptly revoked the nomination, citing concerns with Isaacman's past donations to Democratic political candidates and his ties with SpaceX. (At the time, Isaacman said some people had "axes to grind" and that he was "a good,

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