The yen surged by 1.75% on Friday to 155.63 per dollar, the biggest one-day rally since last year August, flipping what had been a brutal slide and making lawmakers in Tokyo jittery⦠again.
Naturally, Wall Street traders werenβt quiet either. Many pointed to calls made by the New York Fed to several big financial firms, asking questions about the yen exchange rate.
But things arenβt so smooth in Washington. If Japan is expecting a clean team-up, good luck. The US Treasury and Federal Reserve arenβt even pretending to get along right now. And thatβs not great if youβre trying to manage currency chaos.
Bessent blames Japan bonds, not dollar strength
While traders were looking at dollar-yen volatility, Treasury Secretary Scott Bessent threw cold water on the idea of joint intervention. Instead of pointing fingers at exchange rates or the dollar, Scott said it was Japanβs own bond market causing the drama.
Long-term Japanese government bonds took a hit on Tuesday after Prime Minister Takaichi Sanae called a snap election for February 8. Investors expect more government borrowing if she wins, especially since sheβs pushing a two-year cut to grocery sales tax.
That promise spooked bondholders. Yields jumped. Scottie said thatβs what made the yen wobble, not US actions. So while everyone thought the Fed might step in, Scott was saying, in effect: donβt blame us.
Now, keeping US Treasury yields low is a major goal for Donald Trumpβs administration. That matters for everything from federal debt to mortgage rates. A strong dollar makes that harder.
So, if Scott thinks Japanβs domestic choices are to blame for the yenβs mess, heβs not likely to push for joint rescue action. But heβs not just being analytical. Heβs been locked in a growing fight with Fed Chair Jerome Powell.
Bessent joins Trump in attacking Powell
Scott used to bite his tongue. Not anymore. After months of nudging Powell behind the scenes, he joined Trumpβs public push to dump him. In Davos, Scott went on record bashing Powellβs leadership. He took issue with Powellβs decision to show up at Supreme Court hearings involving Lisa Cook, a Fed governor Trump is trying to remove.
βIf youβre trying not to politicize the Fed, for the Fed chair to be sitting there, trying to put his thumb on the scale, is a real mistake,β Scott said on CNBC.
Powell didnβt clap back. He rarely does. But earlier this month, he accused the Justice Department of using criminal threats to force the Fed into cutting rates, something Trump has wanted since day one.
Powell hasnβt said a word about the yen, Japan, or intervention. Heβs got bigger fires. But if Japan really wants coordinated action, someoneβs going to have to make a call. And right now, thereβs no trust between Powell and Scott.
History shows rare but possible joint action
Joint intervention doesnβt happen often. The US has only done it three times since 1996, the last being in 2011, after the earthquake in Japan. Even then, it took all G7 members working together.
Japan last acted in July 2024, buying yen and selling about $35 billion, or 5.53 trillion yen. That was huge. But it was solo.
Scott might not need the Fedβs green light if he decides to go it alone. Heβs already shown heβs willing to break rules. Last fall, he directed Treasury to buy Argentine pesos, just to help President Javier Milei, a Trump ally, ahead of the election. That wasnβt about market stability. That was straight-up political. If he backed Milei, he might be ready to back Takaichi too.
Problem is, the Fed still controls the mechanics if the US is going to touch yen. And Powell isnβt one to follow orders. If Scott tries to push a yen intervention without Powell, thatβll spark a way bigger fight.
Basic economics: the Treasury canβt act without the Fedβs help in execution. If Japan needs the US to act, theyβre not just watching the markets; theyβre watching the drama inside Washington.



















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