However, this is framed as a peacekeeping effort to enforce a potential peace deal, rather than sending troops to engage in active combat.

The UK and other European countries are currently not aligning with the US approach to negotiating a peace between Ukraine and Russia. The US could use the threat or the actual withdrawal from NATO as move to force Europe and Ukraine alignment on the US vision of peace between Ukraine and Russia.

The UK is a NATO country. What IF the UK troops were sent to fight Ukraine or a temporary peace broke down. Russia attacks and kills UK soldiers. Would this have the effect of drawing the USA into the war.

When Britain left the EU, it had the viral name Brexit. A mash-up of Britain and exit.

The President likes to play golf. Getting two under on par on a golf hole is called an Eagle. Eagle is the official US bird and symbol. Calling the US leaving NATO might by EagleOUT.

Another term could be NATO-Later or NATONoMore.

In 2022, there was a widely reported event where President Biden lost his temper in a phone call with Zelensky.

When Biden demanded gratitude from Zelenskyy.. it was just tough diplomacy. When Trump does the same thing, it's an international incident requiring accusations of sabotaging and disrespecting our allies.