Donald Trump has issued his starkest warning yet about the future of the transatlantic alliance, telling a campaign rally in Kansas that the United States may have "no choice but to leave" Europe if its leaders do not reverse course on migration and do more to support Washington. The remarks, delivered on Monday, October 19, tie together three of the world's most volatile storylines — the riots gripping France, the US-led war with Iran, and the reliability of American security guarantees under NATO.
"We stand with Europe, despite its flaws, its weaknesses and, hopefully, its temporary loss of direction. But if they don't soon find their way, we will have no choice but to leave," Trump said at the Heartland Credit Union Arena in Park City, near Wichita, while campaigning for Senator Roger Marshall in a tossup Senate race two weeks before the November 3 midterm elections. He described the situation as "very serious."
The threat is trending per news coverage across outlets in the US, Europe and the Middle East, and it marks an escalation of Trump's long-running critique of NATO — an alliance he has previously called a "paper tiger" and said he was "strongly considering" withdrawing the US from altogether.
What triggered the threat: France's riots and the Iran refusal
Trump linked his ultimatum to two specific grievances. The first is the unrest in France, where more than 500,000 demonstrators reportedly took to the streets on Saturday, with incidents of looting and arson — including a 143-year-old town hall in Limoges being set alight — and new curfews imposed in parts of Paris and other cities. Trump described France as a country being "conquered, looted and burned to the ground," blaming migrants, jihadists and communists whom he accused of hostility toward Christianity and Western civilization. He singled out France, Italy and Germany, and said he had warned President Emmanuel Macron years ago: "close your border or it will be the end of France."
The second grievance is what Trump described as European allies' refusal to assist the United States in the war with Iran. "We spend hundreds of billions of dollars a year on NATO protecting them, but when we said, 'Would you like to help?' No, thank you," Trump said. "'Oh, no thank you?' What does that mean, 'No, thank you'? That is something we won't forget after spending hundreds of billions protecting them." He added that Washington had tested its allies by asking for help despite not needing it, and that the response was something America could "never really forget."
Trump did not explicitly name NATO when making the threat, but his subsequent remarks about the alliance — and the hundreds of billions the US spends on it annually — left little doubt about what was at stake. He framed migration itself as a national-security litmus test for alliances: if European governments are, in his words, importing instability, why should American taxpayers fund their defense against external threats?
The Truth Social post and the midterm context
The rally remarks followed a Truth Social post on Monday in which Trump accused European governments of failing to control their borders and allowing immigration policies to undermine the continent's security and cultural identity. Coverage of the rally also reported Trump describing European leaders' migration policies in stark terms, with some outlets quoting him calling their conduct "treasonous."
The venue was no accident: this was a midterm campaign rally, and Trump explicitly pitched the French unrest as a warning to American voters. "If you want to see what is at stake in this election, just look at what's happening in France," he said, accusing Democratic opponents of pursuing policies similar to those he blamed for Europe's problems. A man was arrested for threatening to kill the president hours before the event, though security concerns did not prevent the rally from going ahead.
The threat also landed amid a difficult polling backdrop: recent surveys put Trump's approval at a record low of around 31 percent ahead of the midterms, with Americans reported as anxious about the economy after the Iran strikes and the surge in fuel prices.
What "leaving" NATO would actually mean
Analysts caution that the US cannot simply walk out of the alliance overnight. The National Defense Authorization Act passed in December 2023 requires a two-thirds Senate vote for any formal withdrawal from NATO — a bar designed to prevent a unilateral exit. But former US ambassador to NATO Ivo Daalder and other analysts note that a president could effectively "hollow out" American commitments without a formal withdrawal: ordering troop pullouts from European bases, skipping joint exercises, withholding intelligence sharing, or ignoring Article 5 mutual-defense requests. Senator Thom Tillis has warned such moves pose "enormous risk" to American global leadership, though enforcement mechanisms for the congressional restrictions remain untested.
European capitals have already been acting as if the guarantee is eroding. In response to Trump's earlier threats, European NATO members launched the ReArm Europe initiative, mobilizing up to €800 billion for independent defense capabilities, and at NATO's 2025 summit members committed to reaching 5 percent of GDP in defense spending by 2035 — a dramatic increase from the 2 percent target many had struggled to meet. NATO's top commander has warned Russia that any attack would prove "utterly futile", even as the alliance stages wargames in Poland rehearsing a postwar Ukraine deployment — all against a backdrop of uncertainty about how much of Washington's commitment can be counted on.
Why the Iran angle matters
Trump's insistence that Europe "wasn't there to help" in the Iran war connects the NATO threat to the broader Middle East conflict that has dominated 2026. The US campaign against Iran has already redrawn global energy and security calculations, and Washington recently postponed further strikes for five days to allow talks. By framing allied non-participation as a betrayal he will "never forget," Trump is effectively making support for the Iran campaign a condition of the US security umbrella over Europe — a new and expansive linkage that European governments have shown no appetite to accept.
For now, the threat remains rhetoric, not policy: there is no detailed timetable, no formal announcement, and no Pentagon order in motion. But each repetition moves the question from whether the US might step back from Europe to how quickly it could do so — and European defense planners are already budgeting accordingly.
Sources: EuropeSays / London Business News, Zark News (White House rapid-response video), BritBrief, MundoAmerica, Hatha Alyoum, Republican Report, caption.news, and Worldlession's earlier reporting on the France riots, Iran war and NATO deployments.