Four Options, Three Days Later
On 6 November, three days after Americans vote, Pentagon officials are due to put at least four courses of action for America’s military footprint in Europe in front of Defense Secretary Pete Hegseth. They are the product of a posture review that Elbridge Colby, the Pentagon’s policy chief, says is meant to move NATO “fast and irreversibly” toward Europe taking primary responsibility for its own conventional defence — and of a questionnaire asking allies whether they restricted US use of their bases and airspace during the Iran war. A Pentagon official has already spoken of “clearly at least some demand signal” for options that downgrade US forces. Many in European capitals read the timing as lucky: a president humbled at the ballot box, the reasoning goes, will be in no position to gut the alliance. That reading is backwards. A weakened Trump is likely to be a harder one on NATO.
A President Losing Altitude — and an Alliance Already Sorted
The numbers are bleak for the White House. A Reuters/Ipsos poll put Trump’s approval at 31% on 19 October, the lowest of his career, with Democrats 12 points ahead on the generic ballot. Decision Desk HQ’s model gives Democrats a 78% chance of taking the House and 57% of taking the Senate. The main drag is the US-Israeli war on Iran, launched on 28 February, which pushed diesel to a record $6.52 a gallon in September.
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The war has also become the organising grievance of Trump’s NATO policy. When European allies declined to help secure the Strait of Hormuz in the spring, Trump openly mused about leaving the alliance. Since then the Pentagon has cancelled an armoured brigade rotation to Poland and announced up to 5,000 troop cuts, mainly in Germany, and convened a “Bergen Group” of favoured allies — Germany, Poland, the Netherlands, Norway, Sweden and Finland — that pointedly excludes Britain, France and the Baltic states. Congress has drawn lines of its own: a 2023 law bars withdrawal from NATO without Senate or congressional approval, and the 2026 defence bill forbids cutting US forces in Europe below 76,000 without first consulting allies.
Congress Guards the Floor, Not the Ceiling
The case for optimism is intuitive. A Democratic House would control spending, wield subpoena power and hold a veto over the annual defence bill, and Republican senators already restive over Iran would feel freer to break ranks. Some of that is true. But it confuses two different things Congress can protect.
What Congress can legislate is the floor of the alliance: formal membership, troop numbers, the rule that an American general commands NATO forces in Europe. What it cannot legislate is the ceiling — the credibility of the American promise to fight. Deterrence under Article 5, NATO’s mutual-defence clause, lives in the Kremlin’s assessment of the president, not of the appropriations committee. A Trump who keeps 76,001 troops in Europe while telling a campaign rally, as he did on 20 October, that “we will have no choice but to leave” if allies do not “find their way” has complied with every statute while hollowing out the thing the statutes exist to protect.
More important is the direction in which domestic pressure has already pushed him. The clearest test came on 9 October. Facing record fuel prices four weeks before the vote, Trump struck a deal with Vladimir Putin for millions of tonnes of Russian diesel; the Treasury exempted cargoes from sanctions until April 2027 — the longest diesel waiver since 2022, and one that cut against a Russia sanctions law Trump had signed a month earlier. Electoral weakness did not make him more deferential to allies or to Congress. It made him willing to hand Moscow a concession, over Ukrainian and European objections, to move a domestic number.
The Bergen Group follows the same logic. Allies are now sorted by loyalty as much as by capability. The Pentagon’s questionnaire asks whether governments publicly back US foreign policy, and Politico reported that the administration had weighed a “naughty and nice list”. Analysts quoted by Euronews link Britain and France’s exclusion to their initial refusal to join the Iran war, and the Baltics’ to their rejection of Colby’s advice to soften their tone towards Moscow. This is not an incoherent policy waiting to be corrected. It is a coherent one — NATO as a tiered clientele — and it needs no congressional consent to function.
Trump’s own record points the same way. Six weeks after losing the House in 2018, he announced a withdrawal from Syria over his defence secretary’s objections; Jim Mattis resigned the next day. The New York Times later reported that Trump had repeatedly told aides that year he wanted to leave NATO. Presidents who lose leverage at home turn to the arena where they act alone. Trump, whose foreign policy already runs on executive orders, sanctions licences and phone calls, has less to lose from a hostile Congress than any modern predecessor. As a recent Modern Diplomacy analysis put it, a defeated president becomes hurried rather than cautious.
The strongest objection is that the Republican coalition is already cracking on precisely these issues. Mitch McConnell publicly rebuked Trump’s NATO threats in April; four Republican senators voted in September to end the Iran war; farm-state Republicans forced a reversal on diesel exports. A bad night on 3 November would speed this up, and a party turning towards 2028 may want distance from an unpopular president’s feuds with allies.
The dynamic is real, but it buys less than it appears. Several of the loudest dissenters, McConnell and Thom Tillis among them, are retiring. The September war-powers resolution still failed 50–49 — the twentieth attempt. Overriding a veto takes two-thirds of both chambers, a margin no forecast offers. Defections limit what Trump can get Congress to do; they barely touch what he can do without it.
So Europe does gain room — in Washington’s legislature rather than its executive, and only briefly. The 2027 defence bill passed the House 216–212 in July but stalled in the Senate, so it will almost certainly be finished in the “lame-duck” session between the election and January. The House version would extend the 76,000-troop floor, order a review of whether the 5,000-troop cut broke last year’s law, and force the Pentagon to justify its posture decisions. That is where European diplomatic energy belongs this winter.
Three Ways the Winter Could Go
Base case — the same policy, delivered harder (55%). Democrats take the House and possibly the Senate. Trump reads the result as proof of disloyalty from allies who “weren’t there”, not as a mandate for moderation. The posture review produces cuts that keep US forces just above the 76,000 floor; Bergen-style sorting widens, with Denmark — fresh from a Greenland basing deal — reportedly next in line; Russia policy keeps bending to fuel prices. There is no formal exit, only steady erosion of credibility. The key assumption: Trump stays inside the legal guardrails while probing their edges.
Downside — the guardrails get tested (25%). The Iran war widens — Washington has already ordered most embassy staff out of Saudi Arabia amid Houthi attacks — and the Pentagon cites operational necessity to pull air defences, munitions and support units out of Europe faster than the consultation rules allow, daring a new Democratic House to litigate. The damage is less numerical than political: Europe learns that the floor itself is negotiable. For governments and companies exposed to NATO’s eastern flank, this is the scenario least priced in.
Upside — Congress locks the floor in place (20%). A chastened Republican Senate leadership and a Democratic House use the lame-duck defence bill to entrench Europe’s posture; Hegseth picks the mildest of his four options; Trump’s attention moves to an Iran settlement and the December G20 summit in Miami, to which he has invited Putin. Europe gets a calmer 2027 — but on borrowed time, because the shift towards Colby’s “NATO 3.0” continues regardless.
Prepare for the Same Policy, Only Harder
Europe’s midterm calculation should not turn on whether Trump will be weaker after 3 November. He almost certainly will be. The question is where that weakness shows. It will show in Congress. It will not show in the policy that matters most to Europe, which runs through the Oval Office, the Pentagon’s posture review and the president’s phone line to Moscow. Governments that spend the winter waiting for a chastened president will be surprised; those that spend it working the lame-duck Congress and speeding up their own rearmament will not.
The signal to watch is the final text of the 2027 defence bill in December: does it extend the 76,000-troop floor and attach conditions to whichever option Hegseth picks? If it does, Europe has bought time. If it does not, the floor was always a courtesy. Either way, NATO’s next chapter will be written by a president with less to lose than ever.
