During President Donald Trump’s visit to Ireland last week, two apparently unrelated announcements captured the character of modern diplomacy. At a golf tournament he said that the United States would remove its tariff on Irish whiskey. During the same visit he said that he would “love” to see a united Ireland.
One statement concerned trade and the other the constitutional future of part of the United Kingdom. Neither was presented through the careful language of a negotiated communiqué. Both arrived with the informality and immediacy which Trump’s supporters regard as evidence that he gets things done.
The promised removal of the whiskey tariff was understandably welcomed. A tariff is a real cost borne by exporters, importers and ultimately consumers. If the exemption is implemented, Irish producers will benefit. Yet there is a distinction between a presidential announcement and an operative customs measure. At the time of writing, public reporting had not identified the legal instrument, commencement date or precise product coverage. Businesses should therefore welcome the political decision while waiting for the administrative detail.
The difference between access and certainty
Personal relationships have always mattered in diplomacy. Leaders meet, flatter, persuade and bargain. There is nothing new or necessarily improper about an Irish government using every available channel to protect an important industry. The problem begins when access to a leader appears more valuable than the rules governing everyone else.
The multilateral trading system was built to reduce precisely that uncertainty. The World Trade Organization describes predictability, transparency and non-discrimination as basic principles. Tariff commitments are meant to give companies a reasonable basis on which to invest, employ people and build supply chains. A concession delivered personally can be valuable, but it can also be personally reversed. It is a favour rather than a settlement until embedded in law.
This matters especially to smaller countries. The United States can absorb disruption, retaliate and force access to senior decision-makers. Ireland cannot match that weight alone. Its leverage comes largely through the European Union, which combines the market power of 27 states. Ireland currently holds the Presidency of the Council of the EU and has identified competitiveness, values and security as its central priorities. Those three objectives depend upon Europe acting collectively rather than each state seeking its own arrangement with Washington.
A narrow exemption may be good news for whiskey producers, but it should not disguise the wider strategic question. If every industry must secure relief through political access, trade policy becomes a queue outside the most powerful office rather than a predictable framework applying across products and countries.
Northern Ireland cannot be decided in passing
The comments on Irish unity illustrate the same tension in a more sensitive field. An American president is entitled to express a preference, and the United States has made an important contribution to peace in Ireland. But Northern Ireland’s constitutional status is not a gift which any foreign leader can confer.
The Belfast Agreement places the principle of consent at the centre of the settlement. Northern Ireland remains part of the United Kingdom unless a majority of its people choose otherwise. If that majority changes, the two governments are obliged to give effect to the democratic decision. The opinion of a US president may influence political discussion, but it neither triggers a referendum nor determines its outcome.
That is not a technical objection. It is the reason the Agreement worked. Competing constitutional ambitions were not abolished; they were placed within agreed institutions and democratic rules. Nationalists could pursue unity without violence. Unionists could support the Union without denying the legitimacy of constitutional change by consent. The stability comes from the rule, not from the preference of whichever powerful outsider happens to be speaking.
Northern Ireland also occupies an unusually exposed economic position. It forms part of the UK customs territory while continuing to apply important EU rules for goods. Its firms sell into Great Britain, Ireland, the wider EU and the United States. Sudden changes in tariffs or product exemptions therefore raise practical questions about origin, certification and competitive advantage. A headline announcement rarely answers them.
The wider lesson
Transactional diplomacy is attractive because it produces visible wins. A tariff disappears, a hostage is released or a defence commitment is obtained. Traditional diplomacy can look slow and bloodless by comparison. Yet institutions and treaties exist because relations between states must survive changes of government, personality and mood.
Ireland should continue to cultivate influence in Washington; failing to do so would be naïve. But it should also insist that concessions are translated into published, durable rules and should resist any suggestion that constitutional questions can be settled through presidential enthusiasm. Northern Ireland’s parties should apply the same discipline: welcome constructive international engagement, but return the argument to the consent principle and to evidence about the social and economic choices involved.
The measure of successful diplomacy is not whether a leader leaves with a favourable quotation. It is whether the agreement still means the same thing after the personalities have left the stage. Whiskey producers need a tariff schedule they can rely upon. The people of Northern Ireland need a constitutional settlement they own. Neither should depend upon a favour.
Sources
- Reuters: Trump announces removal of the Irish whiskey tariff, 13 September 2026.
- Reuters: Trump comments on Irish unity during Ireland visit, 12 September 2026.
- World Trade Organization: principles of the trading system.
- Irish Presidency of the Council of the European Union: priorities.
- The Belfast/Good Friday Agreement.
