Treasury doubles long-dated bond buys as U.S. debt tops $40 trillion, lifting markets

The U.S. Treasury plans to nearly double buybacks of 10–30 year bonds to at least $4 billion per operation over the next two months to tamp down borrowing costs as debt surpasses $40 trillion, sending bond prices up, yields lower, and lifting stocks and cryptos. The surge in debt also highlights near $1.2 trillion in interest payments this year. In other notes, Trump criticizes the Fed and vows action against Iran, while Moderna and Merck report promising cancer-vaccine trial results; Nvidia is pursuing Nordic AI infrastructure deals to connect data centers with its GPUs.