A senior lawmaker proposed a controversial piece of legislation on Wednesday that directs NASA to pick a second company to build the agency’s next Moon landers — in addition to Elon Musk’s SpaceX, which was awarded a $2.9 billion NASA contract to build a lander earlier this year. The bill hasn’t passed the full Senate yet, but it marks a new front in an ongoing effort to overturn or rejig NASA’s decision. It also sets up the first political challenge for NASA’s new administrator, former Sen. Bill Nelson. //

Jeff Bezos’ space firm Blue Origin and Dynetics. Those companies lodged formal protests against NASA’s decision, triggering a procedural pause on SpaceX’s new contract. Among other things, the protests maintain that NASA should have picked two firms instead of one.

Amid a lobbying effort from Blue Origin, those calls have found their way into a NASA authorization bill, proposed as an amendment to the Endless Frontier Act by Sen. Maria Cantwell (D-WA), chair of the Senate Commerce Committee overseeing NASA. Cantwell represents Blue Origin’s home state of Washington. Under Cantwell’s language, NASA would be required to reopen the competition within 30 days and allow it to use $10 billion of its budget to pick a second lunar lander provider.

Before choosing SpaceX, NASA had been expected to pick two companies, a strategy that guaranteed a backup in case one lander fell behind. But the agency went only with SpaceX — its bid was half of Blue Origin’s — after funding shortfalls from Congress. “It was in NASA’s best interest, along with the budget that was there, for us to award to one,” NASA’s human spaceflight chief, Kathy Lueders, who led the decision to pick SpaceX, said last month.