Jared Isaacman, nominee to be NASA administrator of the National Aeronautics and Space Administration, testifies during his first Senate Commerce, Science and Transportation Committee hearing in Russell building in Washington, DC, on April 9. Tom Williams/CQ-Roll Call, Inc./Getty Images

A rare spectacle is set to play out on Capitol Hill Wednesday as Jared Isaacman — the billionaire tech entrepreneur and Elon Musk ally who has been tapped to serve as NASA administrator — faces a second confirmation hearing before the Senate Committee on Commerce, Science, and Transportation.

The hearing is expected to begin at 10 a.m. ET and will be livestreamed on the committee’s website .

Isaacman was first grilled by Senators in April. He was days away from final confirmation for the top NASA j

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