Donald Trump's threat to leave Nato is about to collide with an 800- pound gorilla

Lt Col Stuart Crawford
Thu, 02 Apr 2026 13:28:11 +0000
Membership

We should have become used to US President Donald Trump’s bold and bombastic public outbursts by now. Whether made at White House media briefings or via his Truth Social media account, he changes his mind daily, often contradicting himself and frequently going off on tangents which sometimes bear no relation to the topic at hand.

Not surprisingly, the rest of the world finds this increasingly confusing and frustrating. Does he mean what he says, or indeed say what he means?

His latest tirades have included, inter alia, threats to ‘bomb Iran back to the Stone Age and telling European states to sort out the Strait of Hormuz blockade for themselves.

The most worrying of all, perhaps, has been his recent suggestion that he might pull the USA out of Nato.

As most people will be aware, the North Atlantic Treaty Organisation was set up as a defensive military alliance in the aftermath of the Second World War in 1949. It currently has 32 member nations, with Sweden being the latest state to join in March 2024.

The central pillar of Nato is contained in Article 5 of the Treaty, which, in layman’s language, states that an attack on one member of the Alliance will be regarded as an attack on all, thereby legitimising a collective response from members to military aggression.

It has only been invoked once, in the aftermath of the 9/11 attacks on the World Trade Center (sic) in New York. For European states, the main attraction of Nato is that it guarantees the USA’s, and to a lesser extent Canada’s, involvement in European security.

In truth, the USA has been, to all intents and purposes, the main player and major contributor, and it’s fair to say that Europe has been content to ride on the USA’s coattails for most of the last 77 years of the Alliance’s existence. It’s no secret that this has irritated Trump greatly, both in his first period in the White House and again today.

His criticisms of Europe not paying its way in defence and security matters have dragged most of the European states, albeit in some cases extremely reluctantly, into upping their defence spending. Be that as it may, US participation in Nato is of critical importance, and Trump’s threat to remove it has to be taken seriously.

The question is, does he really mean it? As with all things Trump, it’s hard to tell. He could mean it this morning and not mean it this evening. But can he actually do it?

Well, technically yes, but the National Defense Authorization Act for Fiscal Year 2024, enacted on 22 December 2023, prohibits the President from unilaterally withdrawing from NATO without approval of a two-thirds Senate super-majority or an act of Congress.

This may well put it beyond Trump’s power to do anything, especially after the mid-term elections in November. A Presidential diktat would be both unconstitutional and illegal.

What we appear to be seeing is the outward manifestation of Trump’s frustration at NATO allies’ reluctance to join the Iran war.

This is quite understandable; arguably, Europe should be doing much more to help its ally. As for the USA leaving NATO? I don’t think so.