U.S. lawmakers on Feb. 29 asked President Barack Obama's science adviser whether NASA should continue to subsidize development of more than one privately operated astronaut taxi. During a hearing on the president's 2013 budget request for civilian science and technology programs, White House Office of Science and Technology Policy Director John Holdren was questioned by appropriators skeptical that funding multiple competitors under NASA's Commercial Crew Program was the fastest way to restore independent U.S. access to the international space station.
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