Billionaire investor Stanley Druckenmiller accused the U.S. Treasury of eroding the credibility of the bond market and squandering a critical window for debt reform. He called the Treasury's recent buyback expansion a "mistake."

Last week, the Treasury announced it would double its long-end buyback lots to $4 billion, following the U.S. 30-year yield reaching a nearly 20-year high. The announcement initially triggered a brief rally in bonds, but the gains quickly reversed, signaling investor skepticism about the strategy.

In an opinion article published Monday in the Wall Street Journal, Druckenmiller said markets were "correct" to interpret the increased buyback operations as "price management." He argued that intervening in the long bond yield—the most important price globally—risks drawing the Treasury into even larger buybacks to defend yields, damaging its hard-won reputation for reliability.

Druckenmiller pointed out that these enlarged operations are taking place "through the final stretch of a midterm campaign." He warned: "Debt management that even appears to follow the political calendar spends the one asset that took two centuries to accumulate: the credibility of the Treasury market. That asset doesn't regain its value so easily."

He emphasized that fiscal reform, not monetary tools, offers a durable path to lower yields. "You can't buy your way out of a solvency conversation with liquidity tools," he said.

Druckenmiller called for returning buybacks to their stated purpose: small, scheduled operations. He added: "If the 30-year must trade at 5.5% to clear, that isn't a crisis. It is an invoice. Then do the only thing that durably lowers long-term yields: address the primary deficit."

The Treasury Department did not immediately respond to a request for comment.

Druckenmiller is widely known as an architect behind George Soros's famous bet against the British pound. He has worked alongside both Treasury Secretary Scott Bessent and Federal Reserve Chair Kevin Warsh in investing roles.