The G20 was cartographed because the world economy had become too interconnected to be managed by a handful of powerful states. In 2026, that principle faces an unusual test. Under the United States presidency, Washington has narrowed the forum’s agenda, limited participation and placed its own economic priorities at the centre of the process. At the same time, speculation around high level US-China diplomacy raises a sharper question. Is the G20 still a forum, where major economies shape global rules together or is it becoming a grand stage on which the two largest powers conduct their own business? The G20 does not become bilateral simply because Donald Trump and Xi Jinping meet. It becomes bilateral when the other chairs begin to serve as scenery for priorities decided elsewhere.
Washington argues that it is not weakening the G20 but rescuing it from excessive expansion. The US State Department says its presidency is returning the forum to its “core economic agenda.” Its three priorities are limiting regulatory burdens, securing reliable and affordable energy and promoting new technologies. Poland has also been included as the only full guest participant of the US host year, while the leaders’ summit will take place at Trump National Doral Miami on December 14 and 15. There is logic behind a narrower agenda. The G20 has gradually expanded far beyond the financial coordination that drove its rise after the 2008 financial crisis. A forum that tries to address everything can eventually become effective at nothing.
But an agenda can be streamlined without being neutral. The Council on Foreign Relations notes that climate change, development, inequality and sustainability have been pushed aside as Washington shifts attention towards deregulation, energy and technological innovation. These were not peripheral concerns for previous presidencies. They became important partly because emerging economies transformed the G20 from a crisis management committee into a wider platform for global economic governance. For example, South Africa’s 2025 presidency placed development, debt and sustainability much closer to the centre. Therefore, the transition from Johannesburg to Miami represents more than a change of annual themes. What Washington calls a return to basics may look to the Global South like a return to somebody else’s priorities.
South Africa’s position makes the institutional question even more serious. President Trump announced that South Africa would not be invited to the 2026 summit. Pretoria responded that it is a G20 member “in its own name and right” and called for all members to participate on an equal footing. This distinction matters. Host countries traditionally exercise considerable influence over invitations to non-members. However, South Africa is not an observer asking for a seat. It is already part of the institution.
Stay ahead of the geopolitical week.
MD Briefing delivers expert analysis across five global fronts — the Indo-Pacific, energy, geoeconomics, European security, and the Middle East — every Monday morning. Free.
At the same time, Poland has been brought into the US process as its only full guest participant. Poland may have a legitimate economic case for greater involvement. The deeper issue is the precedent created when a rotating presidency can marginalise an existing member while elevating a politically preferred non-member. A rotating presidency gives a country the gavel. It should not give it ownership of the table. If this principle weakens in Miami, future hosts may find it easier to use participation itself as diplomatic leverage.
The agenda presents a similar contradiction. Washington says it wants a less political G20 focused on practical economic outcomes. But the narrower forum is not necessarily becoming less geopolitical. Reuters reported on August 28 that the US hosted finance process is focusing on global imbalances, sovereign debt, resilient supply chains and competition based on productivity and innovation. Washington also intends to press G20 partners over Iran’s economic links and its sanctions campaign. The G20 may be getting a smaller agenda but not necessarily a less political one. Politics has not disappeared. The politics being prioritised have changed.
Technology provides another example. Reuters reported on August 27 that leading technology figures, including OpenAI chief Sam Altman and Nvidia chief Jensen Huang, are participating in a US hosted G20 technology gathering as Washington promotes a lighter regulatory approach towards Artificial Intelligence. Innovation clearly belongs in any serious discussion of future economic growth. But the choice also reveals how a presidency can use agenda setting power to internationalise its own economic philosophy. The question for other members is whether the G20 is building common rules or becoming a vehicle through which each annual host temporarily projects its preferred model.
This is where China enters the story. A Trump Xi meeting should not itself be treated as evidence of institutional decline. Bilateral meetings have always taken place on the margins of multilateral summits. Indeed, bringing rival powers into the same physical space is one of the advantages of institutions, such as the G20. Current diplomacy between Washington and Beijing is active, although the exact arrangements for future presidential meetings remain subject to negotiation.
The real test is different. If Miami becomes politically important mainly because it provides the setting for a US China bargain while the collective G20 process produces little substance, the institution will have developed a bilateral centre of gravity. Reporting on the ongoing Sherpa process has already raised this concern with delegates describing fears that the summit could become a backdrop for Trump-Xi diplomacy. The White House rejects that interpretation and says it is pursuing a streamlined economic programme. The test of Miami is not whether Trump and Xi shake hands. It is whether the world remembers what the other chairs were there to discuss.
For European members, this shift raises questions about their ability to defend climate and regulatory priorities inside a forum increasingly shaped by US-China competition. For developing economies, the stakes may be higher. Debt distress, development finance, inequality and climate vulnerability are not abstract additions to economic governance. They determine fiscal space, investment and growth across much of the Global South. Removing these issues does not make the G20 apolitical. It changes whose economic problems receive collective attention.
The consequences could also survive the Trump presidency. G20 presidencies rotate. A precedent created by Washington can later be used by governments whose geopolitical preferences Washington dislikes. If the host can marginalise a member, reshape participation around political relationships and narrow the collective agenda according to national priorities, institutional continuity becomes dependent on the preferences of whoever holds the presidency that year. The G20 could slowly move from multilateral governance towards rotating national ownership.
Therefore, Miami will provide a remarkably clear test. The evidence will be in the final declaration, the treatment of South Africa and the political weight given to any US-China bilateral encounter. If debt, development and other Global South concerns return meaningfully to the negotiated text, the G20 may prove more resilient than its critics expect. If members collectively shape the outcome despite Washington’s preferences, the institution will have demonstrated that a strong host does not automatically mean a weak forum. But if the declaration largely mirrors US priorities, a member remains excluded and the summit is remembered principally for what Trump and Xi discuss outside the main room, the answer will be harder to avoid.
The G20 rose to prominence because the global economy could no longer be governed by a small club of powerful states. Miami will test whether that lesson still holds. If nineteen delegations arrive mainly to watch Washington and Beijing determine the summit’s political meaning, the G20 will not have disappeared. It will have become something more subtle, a multilateral institution with a bilateral centre of gravity.
