The U.S. dollar is struggling to regain momentum after falling to multi-month lows, with investors increasingly focused on America's debt trajectory, Treasury-market intervention and the possibility that Washington's efforts to contain long-term borrowing costs could undermine confidence in the currency.

The greenback remained under pressure on Monday as traders assessed the Treasury Department's plan to increase purchases of longer-dated government bonds, while also waiting for details of new U.S. sanctions against Iran and upcoming central-bank speeches. The euro was near $1.1665, close to its recent three-month high, while sterling remained near a six-month peak.

The unusual combination of weaker Treasury yields, rising fiscal concerns and strong demand for alternative assets has turned the dollar into one of the most closely watched markets this week.

The most immediate issue is the Treasury's decision to expand its long-end bond buybacks.

Treasury Secretary Scott Bessent recently announced that the government would double selected purchases of longer-dated Treasury securities to at least $4 billion per operation. The intervention is relatively small compared with the roughly $32 trillion Treasury market, but investors have focused on what the decision signals about Washington's willingness to respond to rising long-term yields.

The concern is not simply the size of the purchases.

Some traders see the policy as evidence that Treasury officials are increasingly uncomfortable with long-term borrowing costs and may be prepared to intervene more aggressively if yields remain elevated.

That perception matters for currencies because investors typically expect higher U.S. yields to support the dollar. When yields rise for reasons associated with fiscal stress rather than stronger economic fundamentals, however, the relationship can break down.

The dollar has historically benefited when U.S. interest rates are higher than those of major trading partners.

But the recent market environment is more complicated.

Long-term yields have been rising around the world because of stronger growth expectations, inflation concerns and growing sovereign debt burdens. The U.S. is therefore competing for capital with other developed economies at a time when its own fiscal outlook is under increased scrutiny.

The Treasury buyback decision has intensified that debate.

Investors are asking whether Washington can keep long-term yields under control without addressing the underlying budget deficit and debt accumulation.

That concern has encouraged some investors to shift toward gold and Bitcoin, both of which have posted strong gains as the dollar weakened. Reuters noted that Bitcoin gained nearly 23% against the dollar last week while gold climbed about 5%.

A growing part of the market is now treating the dollar's weakness as something more structural than an ordinary currency cycle.

The so-called debasement trade involves purchasing assets that investors believe can retain value if government debt grows faster than the economy or if policymakers attempt to keep borrowing costs from rising too quickly.

Gold is the traditional choice.

Bitcoin is increasingly being added to that basket.

The recent price action reinforces that narrative because both assets rallied even as U.S. stocks weakened.

That is different from a conventional risk-on trade, in which Bitcoin tends to rise alongside technology stocks.

The pressure on the dollar is visible across major currency pairs.

The euro remains near its three-month high, while sterling is close to its strongest level against the dollar in six months. The Chinese yuan has also strengthened, reaching a roughly three-and-a-half-year high against the U.S. currency.

The yuan's strength is particularly noteworthy because Chinese authorities traditionally manage the currency carefully.

A stronger yuan suggests that the dollar's weakness is broad rather than limited to one or two currency pairs.

Japan presents a more complicated picture.

The yen remains relatively weak, but investors are closely watching the Bank of Japan for signs that policymakers could accelerate rate increases.

A more hawkish BOJ could eventually provide another source of support for the yen and additional pressure on the dollar.

Currency markets are also dealing with a renewed escalation in U.S.-Canada trade tensions.

The United States has imposed 50% tariffs on Canadian goods, while Canada has announced retaliatory measures. The Canadian dollar weakened about 0.5% against the U.S. dollar during Monday's trading.

The broader issue is that trade restrictions can affect both growth and inflation.

If tariffs raise import costs, the Federal Reserve could face greater inflation pressure.

If retaliation hurts economic activity, policymakers could simultaneously face weaker growth.

That combination can make the dollar harder to value because investors must assess competing forces.

The next major focus is Federal Reserve Chair Kevin Warsh's speech at Jackson Hole on Friday.

Investors want clues about how the Fed views the interaction between interest rates, Treasury supply and the recent rise in long-term yields.

Any comments about the size and composition of the Fed's balance sheet, Treasury issuance or the term premium could have a major impact on the long end of the yield curve and therefore on the dollar.

Warsh's traditionally cautious communication style means traders may not receive the detailed guidance they want.

That uncertainty itself can contribute to volatility.

U.S. Treasury Secretary Bessent is also expected to announce what he has described as the “toughest sanctions in history” against Iran.

Markets are watching whether those measures will target China's purchases of Iranian oil or other countries that continue trading with Tehran.

The outcome could influence several markets simultaneously.

Stronger sanctions could push oil prices higher, which would increase inflation risks.

That could support the dollar through the interest-rate channel but weaken it through concerns over economic growth and fiscal pressure.

The greenback remains the world's dominant reserve currency and continues to benefit from deep U.S. capital markets.

Nothing about a period of multi-month weakness changes that status overnight.

But currency markets price expectations.

If investors increasingly believe that Washington will prioritize preventing long-term yields from rising over tackling the structural fiscal deficit, they may demand greater diversification away from dollar assets.

That is the deeper significance of the current move.

The next phase of the dollar's decline or recovery will likely depend on several developments arriving almost simultaneously.

The market wants to see the details of U.S. sanctions on Iran, the trajectory of oil prices, the reaction of Treasury yields to further buybacks and the tone of Warsh's Jackson Hole speech.

A stronger dollar could return if Treasury yields rebound and the Fed signals a persistent anti-inflation stance.

Conversely, further fiscal anxiety and lower long-term yields could encourage additional diversification into gold, Bitcoin and other currencies.

For now, the dollar remains pinned near multi-month lows because investors are no longer looking only at interest-rate differentials.

They are increasingly asking a broader question: how much confidence should global investors place in the long-term value of U.S. government debt and the currency used to finance it?