Bessent Defends Yen Intervention as Warren Demands Answers on August 29

Treasury Secretary Scott Bessent and Senator Elizabeth Warren escalated their dispute over the U.S. intervention in the Japanese yen on August 28 and 29. Bessent rejected Warren’s suggestion that American taxpayers faced repayment risk, saying Treasury simply exchanged existing foreign-currency assets for yen without extending credit to Japan. The clash highlights disagreement over whether the July 31 coordinated intervention with Japan was necessary to prevent global market instability.

What happened between Bessent and Warren

On August 13, Warren sent Bessent a letter questioning the Treasury’s decision to use its Exchange Stabilization Fund to buy yen after the Japanese currency fell to a 40-year low. Warren suggested American taxpayers could bear the cost if Japan failed to repay Treasury. On August 28, Bessent responded by attacking Warren’s understanding of foreign exchange markets, writing on X that she knows “even less about foreign exchange markets than she does about banking.” He offered Warren and her staff a “Foreign Exchange for Dummies” tutorial. Warren fired back on August 29, pointing to recent setbacks for Bessent and saying his failed intervention had burned credibility.

The core disagreement over the yen purchase

Warren’s August 13 letter incorrectly suggested Japan owed money to Treasury, according to Bessent. However, Warren’s letter later correctly described the intervention as a currency swap. Bessent clarified in his response that Treasury exchanged existing Exchange Stabilization Fund foreign-currency assets for yen. “No new congressional appropriation was involved, and no credit was extended to Japan. Japan owes Treasury nothing,” Bessent wrote. Treasury swapped euros for yen but has not disclosed the exact amount purchased.

Why Bessent says the intervention matters to Americans

Bessent argued that yen instability poses a direct risk to U.S. borrowing costs. Japan is one of the largest foreign holders of U.S. Treasury bonds. Disorderly yen markets can trigger forced unwinds, which could destabilize global markets and ultimately raise borrowing costs for American families and businesses, Bessent wrote in an August 27 letter. The yen hit 160 per dollar on August 28, erasing more than half of its gains from the July 31 intervention. Japan’s Ministry of Finance disclosed on August 28 that its total intervention between July 30 and August 26 reached roughly $97 billion.

The intervention’s limited success so far

The U.S. and Japan conducted their first coordinated yen-buying intervention since 1998 on July 31. The yen initially strengthened but has since weakened again, passing 160 per dollar on August 28, near its weakest level in a month. Hedge funds have returned to building short yen positions, betting the currency will weaken further. The intervention’s failure to hold gains has fueled Warren’s criticism and raised questions about whether the Treasury’s approach addresses the underlying economic imbalances between the U.S. and Japan.

Final Thoughts

Bessent’s defense of the yen intervention reflects Treasury’s concern that currency instability could raise U.S. borrowing costs. Warren’s oversight questions remain valid even if her initial framing mischaracterized the transaction. The yen’s renewed weakness suggests market fundamentals may override policy intervention.

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