The Treasury Department is appointing an ally of billionaire Elon Musk’s U.S. DOGE Service to a senior position in the department overseeing the nation’s powerful payment systems, according to two people with knowledge of the matter,

DOGE’s earlier actions at the Treasury have become a focus of congressional scrutiny and a federal court battle in recent days. Musk’s team initially tried to halt money going to the U.S. Agency for International Development from the Treasury’s payment system.