WASHINGTON — Congress and the White House are at loggerheads about details of a bill designed to make it easier for U.S. space companies to sell their wares abroad, a senior U.S. government official said.

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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...