The Treasury Department just pushed down long-term US bond yields. That could make Kevin Warsh's job harder.

Treasury Secretary Scott Bessent announced Wednesday that the U.S. will at least double its purchases of 10-year, 20-year and 30-year Treasury bonds starting Sept. 9 through Nov. 4, pushing down long-term bond yields. The move complicates Federal Reserve Chairman Kevin Warsh's inflation-fighting strategy, as markets had been naturally repricing long-term debt higher—a tightening effect Warsh had welcomed as an alternative to raising short-term rates. Analysts warn Warsh may now be forced to raise interest rates more aggressively to counteract the Treasury's expansionary action, working against his preference for market-derived rates.