Bessent faces G20 test over Iran sanctions, tariffs and US debt

Scott Bessent has chosen the Blue Ridge Mountains as the stage for his attempt to bend the G20 to the Trump administration's economic worldview. The US Treasury secretary arrives in Asheville, North Carolina, on Monday for two days of meetings with finance ministers and central bank governors from the world's largest economies. He comes armed with three demands: tighten the squeeze on Iran, shrink global trade imbalances, and calm a bond market that has pushed 30-year US yields to their highest level in 19 years.

The agenda is ambitious. The reality is messier. Since the last G20 finance gathering under South Africa's presidency, the Strait of Hormuz has been closed by the widening conflict with Iran, choking energy flows to Europe and Asia. Washington has threatened secondary sanctions against any country that continues to buy Iranian oil or facilitate transactions with Tehran. On Friday, the Treasury imposed restrictions on an Egyptian bank over its UAE branches' links to Iran, a signal that the net is widening to include G20 members themselves.

Iran sanctions collide with European energy security

For European capitals, the Iran pressure is not abstract. The closure of Hormuz has lifted energy and commodity prices across the continent, feeding into inflation that the European Central Bank has only recently brought back toward target. Germany's manufacturing sector, already weakened by two years of stagnation, faces higher input costs at a moment when the US is also threatening a new round of tariffs. The European Commission has been preparing contingency measures for energy supply disruptions, but the combination of sanctions compliance and physical supply loss leaves little room for manoeuvre.

Mark Sobel, who negotiated G20 communiqués for both Republican and Democratic administrations, put it bluntly: ministers "won't buy into soothing words" and "their economies are being adversely hit by Trump's war on Iran, which their countries don't support." The former Treasury official, now US chair of the OMFIF monetary policy think tank, added that no amount of US diplomacy can change those realities.

A tariff architecture rebuilt after the Supreme Court

The Iran dossier shares the agenda with a trade war that has been reconstructed since February, when the US Supreme Court struck down President Trump's broad global tariffs under the International Emergency Economic Powers Act. The administration has since rebuilt the levies under different legal authorities. In July, 60 economies, including every G20 member and the European Union, were hit with 10% or 12.5% tariffs for allegedly lax enforcement of forced labour bans. Sixteen of America's top trading partners, more than half of them G20 members, now face additional duties to counteract what Washington calls excess industrial capacity.

A senior Treasury official described global trade imbalances as the result of "distortive government economic policies that prevent fair competition" and said they would be a major discussion topic in Asheville. The framing is deliberate: it shifts the burden onto surplus economies, China, Germany, Japan, while sidestepping the US side of the equation. The United States ran a goods and services deficit of $918 billion in 2025, according to the Bureau of Economic Analysis, a figure that has widened even as tariffs have multiplied.

China's export surge and the European dilemma

European officials arriving in Asheville are less focused on Iran than on the flood of Chinese goods arriving at their ports. With high US tariffs and an outright ban on Chinese vehicles, Beijing's export machine has redirected toward Europe. Chinese exports rose 23.9% year-on-year in July, led by electric vehicles, semiconductors and green technology equipment. The IMF estimates the yuan is undervalued by 21%, giving Chinese producers a built-in price advantage that European manufacturers say amounts to unfair competition.

A European official due to attend the meetings said the bloc wants the G20 to address the "growing flood of Chinese exports that is threatening their industries, including autos." The European Commission has already launched anti-subsidy investigations into Chinese electric vehicles and is reviewing state aid rules to allow member states to respond more aggressively. But China has shown little interest in longstanding G20 calls to reduce industrial subsidies and rebalance toward domestic consumption.

The missing half of the rebalancing equation

Economists note that the US has shown scant interest in the other side of the rebalancing ledger: a meaningful reduction in fiscal deficits that would dampen American demand for imports. Total US public debt crossed $40 trillion on 19 August, having doubled since 2017 across two Trump terms and the intervening Biden presidency. The Congressional Budget Office projects deficits averaging 6.3% of GDP over the next decade, a trajectory that would push debt-to-GDP above 130% by 2035.

Markets have taken notice. Yields on 30-year Treasuries climbed to 4.87% this month, the highest since 2007. Bessent responded by announcing a doubling of scheduled buybacks of longer-dated securities to $4 billion per operation, a move that briefly cooled yields but drew sharp criticism. Stanley Druckenmiller, the billionaire investor who once mentored Bessent, warned that the Treasury risks undermining the "regular and predictable" issuance that underpins the Treasury market's status as the world's risk-free benchmark.

Currency intervention and the credibility question

The Treasury's market interventions have not been confined to domestic bonds. On 1 August, the US joined Japan in coordinated intervention to support the yen, the first such operation since 1998. In October 2025, the Treasury purchased Argentine pesos to stabilise that currency. A senior Treasury official defended the bond buybacks by saying long-bond yields had "risen above what we consider fair value" and that the department was committed to bringing them lower. The formulation is unusual: Treasury secretaries typically avoid targeting specific yield levels, leaving price discovery to the market.

Central bankers in the G20 are watching closely. The European Central Bank, the Bank of Japan and the Bank of England all rely on deep, liquid sovereign debt markets for their own policy transmission. If the US Treasury begins to act as a de facto yield-curve manager, the implications for global monetary policy coordination are profound. Several governors are expected to raise the issue privately in Asheville, though none will do so in the communiqué.

A forum adrift from its founding purpose

The G20 was elevated to a leaders' forum in 2008 to coordinate fiscal and monetary stimulus against the deepest recession since the 1930s. Its last major collective action came in 2020, when members agreed to inject $5 trillion into the global economy to combat the pandemic. Since then, the forum has drifted. South Africa's 2025 presidency focused on the climate crisis. Brazil's 2024 presidency pushed proposals for a global wealth tax. The US boycotted the South African summit entirely.

Bessent's team says the Asheville meeting is an effort to return the G20 to its roots: growth, reduced regulation, more energy production, and private-sector innovation. But the forum's diversity, it includes China, Russia, Saudi Arabia, India, Brazil and the EU alongside the G7, makes consensus on any substantive issue nearly impossible. The final communiqué will likely be a bland restatement of shared principles, with the real negotiations happening in bilateral rooms.