WASHINGTON — SpaceX Chief Executive Elon Musk lashed out at Blue Origin and United Launch Alliance Tuesday night, accusing the two companies of trying to stymie SpaceX’s expansion plans with a “phony blocking tactic” that has stalled the lease of an old space shuttle launch pad SpaceX wants to take over.

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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...