The U.S. Treasury is using a larger bond-buyback program to respond to rising pressure in the long-term Treasury market, placing the dollar, fiscal policy and the Federal Reserve’s interest-rate outlook at the center of investor attention.

The move comes after concerns over the expanding U.S. fiscal deficit pushed long-term borrowing costs higher. On Wednesday, the Treasury said it would double the size of its buybacks of 10- to 30-year debt to at least $4 billion per operation. The initiative is intended to provide greater support to the longer end of the Treasury market at a time when investors have been demanding higher compensation for holding long-duration government debt.

The policy intervention immediately affected currency markets. The dollar initially came under sharp selling pressure as investors considered whether fiscal concerns that might normally be reflected through higher long-term yields could instead be expressed through a weaker U.S. currency. That dynamic has also supported alternative assets such as gold and bitcoin.

However, the market response changed on Thursday as Treasury yields resumed their climb. Sarah Ying, head of FX strategy at CIBC Capital Markets, described the development as Treasury Secretary Scott Bessent testing the market while investors pushed back against the policy signal. Bessent subsequently indicated that the Treasury could increase the volume of bonds it repurchases again, arguing that current yields do not reflect underlying fundamentals.

The immediate challenge for Washington is therefore not simply the level of Treasury yields, but the credibility of its ability to influence longer-term financing conditions without eliminating the market's concerns over fiscal sustainability. Shaun Osborne, chief FX strategist at Scotiabank, said the timing of the announcement appeared unusual because it came shortly after the Treasury’s quarterly refunding statement and ahead of a 20-year bond auction.

The dollar’s performance reflects this tension. The dollar index rose 0.06% to 98.89 on Thursday after earlier losses, while the euro slipped 0.01% to $1.1676 after reaching $1.171, its highest level since May 14. The Japanese yen weakened 0.6% to 159.12 per dollar, while sterling strengthened 0.18% to $1.3629 and reached its highest level since February 16.

The Treasury’s actions are also unfolding alongside renewed uncertainty over Federal Reserve policy. Investors are looking to Federal Reserve Chairman Kevin Warsh’s upcoming speech at the Jackson Hole symposium for indications of how the central bank intends to address persistent inflation. Warsh took over as Fed chair in May and provided limited guidance after the July meeting.

Minutes from the July Federal Reserve meeting showed that inflation concerns had intensified. Several policymakers were prepared to raise interest rates, while many indicated that higher borrowing costs would be necessary if inflation failed to move toward the central bank’s 2% target. Market pricing subsequently placed the probability of a September rate hike at 35%, rising to 67% for December.

For markets, the interaction between Treasury financing decisions and Federal Reserve policy is becoming increasingly important. A Treasury strategy aimed at limiting pressure on longer-term yields is being assessed alongside inflation risks and expectations for future interest rates, creating a more complex environment for the dollar and other major asset classes.

The broader market response also shows that official intervention does not automatically determine investor expectations. The initial decline in the dollar was followed by a recovery as Treasury yields moved higher again, underscoring the importance of fiscal credibility, inflation expectations and demand for U.S. government debt in determining the direction of financial markets.