WASHINGTON — Two U.S. senators flatly accused the White House of trying to sabotage the nation’s human spaceflight program after a newspaper report based on leaked NASA documents said a congressionally mandated heavy-lift rocket, crew capsule and associated infrastructure could cost nearly $63 billion through 2025.

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Dan Leone is the NASA reporter for SpaceNews, where he also covers other civilian-run U.S. government space programs and a growing number of entrepreneurial space companies. He joined SpaceNews in 2011.Dan earned a bachelor's degree in public communications...