Indeed, the global power shift is making international cooperation more complex in a number of ways, and this in turn has implications for the nature of multilateralism more broadly. Many commentators squarely blame Trump for undermining the liberal international order and withdrawing the US from global leadership. As Donald Tusk, then European Council President, put it during remarks at the 2018 G7 summit in Canada, “the rules-based international order is being challenged [...] by its main architect and guarantor, the US” (as cited in Buncombe 2018). Trump has not made a secret of his disdain for multilateral agreements or the international rule of law. He has withdrawn the US from the Paris Accord, the Iran Nuclear Deal, the Intermediate-Range Nuclear Forces (INF) Treaty, the UN Human Rights Council, and UNESCO. He has threatened to withdraw from the World Trade Organization (WTO) and from NATO, and he has announced his intent to withdraw from the World Health Organization (WHO). The White House has also sought to restrict or end funding for a number of UN programs. Trump’s rejection of multilateralism has proven particularly challenging for transatlantic cooperation given the extent to which the transatlantic partnership has been embedded in and anchored by multilateral institutions.
Nevertheless, the US has a long history of ambivalence towards multilateralism that did not begin with Trump (Viola 2018). The very origins of American liberal internationalism began with Congress’ refusal to join the League of Nations over concerns of compromising American sovereignty and being beholden to foreign political interests. Some of Trump’s actions have precedent in the Reagan administration, which withdrew from UNESCO in 1984 and froze UN budgetary assessments to zero real-growth, making UN agencies increasingly dependent on voluntary contributions (Graham 2015). Threats to curb US funding for the UN, and even to end US membership, have continued to be features of the US’ attempts to exert influence over multilateralism (Bond 2003).Footnote 3 Moreover, compared to other advanced democracies, especially European countries, the US has often been a laggard in ratifying international agreements, including the International Criminal Court, the Kyoto Treaty, the Ottawa Landmines Convention, the Comprehensive Test Ban Treaty, the Convention on Biological Diversity, and the Convention on the Law of the Sea. The George W. Bush administration was characterized by similar debates over the end of multilateralism, with many voices criticizing the US’ undermining of the liberal order (Kupchan and Trubowitz 2007). Arguably, even former President Barack Obama, who was rhetorically committed to multilateralism, failed to move US foreign policy in a decisively multilateral direction. The Obama administration had a few notable multilateral successes, but overall it emphasized diplomacy within ad hoc, informal groupings of states, such as on nuclear negotiations or on negotiations over trade in services, rather than within the traditional formal institutions associated with the liberal order (Skidmore 2012).
What explains US ambivalence towards multilateralism? A consideration of the historical pattern offers reasons to believe that the current trend could continue beyond Trump’s presidency. Overall, US presidents have generally understood that multilateral institutions can be powerful instruments of foreign policy because of their ability to reduce transaction costs, promote compliance, and generate legitimacy. But the sovereignty costs of participating have proven acceptable only as long as the US has the power to set the terms of cooperation in alignment with its interests or exempt itself when institutional constraints become too costly. The US has always been skeptical about subordinating itself to rules and decisions that it did not fully control and has always sought to preserve its ability to exclude itself from the rules. As a result, the US tends to be most willing to support multilateralism when its relative power is high, and more reluctant as its relative power declines.
During the Cold War and the immediate post-Cold War period, the costs of using large-scale multilateralism were relatively low for the US because of a broad alignment of interests between the US and countries in its sphere of influence. Even during this period, however, US support for inclusive multilateralism was contingent; the US expected major allies to defer to American leadership and interests. When goals and interests diverged, the US was able to use its hard and soft power resources to enforce convergence around its preferred outcomes.
But today, a number of rising powers with diverse preferences are becoming critical to global cooperation while the US’ ability to dominate multilateral institutions has declined. As rising powers with preferences that diverge from US interests become more important for achieving cooperative outcomes, collective action and distributional problems intensify. The US’s relative power decline, meanwhile, decreases its ability to deploy side-payments and inducements to overcome preference divergence and impose its own preferred outcomes. This has become clear with the deadlock at the WTO and with respect to the leverage that rising powers now have in trade negotiations, in climate agreements, and in security cooperation. This redistribution of power increases the likelihood that the benefits of multilateralism are outweighed by the costs of achieving alignment with the US’s own preferences. This, in turn, produces incentives for the US to pursue its interests within a more selective, exclusive institutional setting where it can create a consensus among a group of like-minded states and, possibly, exert pressure on excluded states to make concessions (Viola 2020). The US uses minilateralism as a strategy for increasing its bargaining leverage and for circumventing the collective action and distributional problems of more inclusive multilateral negotiations.
Extrapolating this argument, then, we should expect US skepticism of large-scale multilateralism to continue as its leverage declines—no matter who is president. Even if it continues to support multilateralism, the US will likely face incentives to pursue its interests through minilateral or bilateral deals with like-minded states. Of course, the set of possible like-minded actors typically includes the EU and many European states because values and interests are still extensively shared across the Atlantic. Nevertheless, the form that multilateral cooperation takes is changing and the move away from large-scale multilateralism will re-shape the status quo institutional order (Viola 2020).