Billionaire tech entrepreneur Jared Isaacman returned to Capitol Hill Wednesday for his second confirmation hearing for the role of NASA administrator. Members of the Senate Committee on Commerce, Science, and Transportation grilled him with questions about a leaked document outlining his controversial vision for the agency.

The manifesto, titled Project Athena , came up repeatedly during the 10 a.m. ET hearing . Senators raised concerns about lines in the document that suggest to them that Isaacman would reevaluate NASA’s plan for a sustained lunar presence, outsource data collection to private companies, and weaken the agency’s climate science capabilities.

For his part, Isaacman largely downplayed their fears, casting them as misinterpretations of Project Athena’s language and its

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