It's hard to see how any European country will now be able and willing to trust the United States
In the long arc of the postwar order, the security guarantees that bound the Atlantic world together were never meant to be conditional — yet this week, Donald Trump signaled that America's military presence in Germany, the largest on the continent, may be subject to review following a public dispute with Chancellor Merz over Iran negotiations. The threat, delivered via social media, arrives as NATO faces what observers are calling its gravest crisis, raising the question of whether eighty years of collective defense can survive being treated as a bargaining chip. What is at stake is not merely troop numbers, but the foundational trust upon which an entire architecture of peace was built.
- Trump announced a formal review of reducing the 35,000–50,000 US troops stationed in Germany, the largest American military contingent in Europe, sending an unmistakable warning to a key ally.
- The trigger was Chancellor Merz's public suggestion that Trump's team was being outmaneuvered by Iranian negotiators — a criticism that drew a sharp presidential rebuke and accusations that Merz was comfortable with a nuclear Iran.
- The dispute has exposed a deeper fracture: Trump has already floated full NATO withdrawal, threatened to invade Greenland, and called allied leaders cowards, leaving European capitals scrambling to assess how much of the alliance's security guarantee remains intact.
- Legal barriers exist — formal NATO withdrawal requires a two-thirds Senate majority — but experts warn that withdrawing troops achieves the same strategic damage without ever leaving the alliance on paper.
- Former NATO ambassador Ivo Daalder voiced what many are thinking: it is now difficult to imagine any European nation trusting that the United States would come to its defense.
Donald Trump announced Wednesday that his administration was reviewing a possible reduction of American troops in Germany — a statement that arrived days after German Chancellor Friedrich Merz publicly suggested Trump's negotiating team was being outplayed by Tehran. Merz had described how Iranian officials allowed American envoys to travel to Islamabad only to leave empty-handed, adding that Europe was suffering from Iran's closure of the Strait of Hormuz. Trump fired back on Tuesday, accusing Merz of being comfortable with a nuclear Iran and saying the chancellor "doesn't know what he's talking about."
Merz attempted to de-escalate on Wednesday, insisting his relationship with Trump remained strong. But the troop threat told a different story. Germany hosts between 35,000 and 50,000 US military personnel — the largest American concentration in Europe and a cornerstone of the continent's defense architecture. The United States maintains over 68,000 active-duty troops across Europe in total.
The episode is part of a broader pattern. In early April, Trump said he was seriously considering withdrawing from NATO altogether, citing European allies' failure to support the American-Israeli campaign against Iran or help reopen the Strait of Hormuz. While formal withdrawal faces significant legislative barriers — a 2024 law requires a two-thirds Senate majority — experts note that withdrawing troops would achieve comparable strategic damage without technically leaving the alliance.
Trump has spent both his presidencies accusing NATO members of underspending and freeloading, but recent weeks have seen the rhetoric sharpen into something more destabilizing: threats against Greenland, accusations of cowardice leveled at allied leaders, and suggestions of a quick ceasefire in Ukraine after a call with Vladimir Putin. Former NATO ambassador Ivo Daalder put it plainly — it is now hard to see how any European country could trust that America would come to its defense. Experts have begun calling this the worst crisis the alliance has ever faced, one in which the premise of American commitment appears to have become conditional on political agreement rather than treaty obligation.
Donald Trump announced Wednesday that his administration was reviewing the possibility of reducing American military forces stationed in Germany, a move that landed like a warning shot across the Atlantic just days after the German chancellor had publicly criticized the president's handling of Iran negotiations.
The announcement came via Truth Social, where Trump said the administration was "studying and reviewing the possible reduction of troops in Germany, with a determination to be made over the next short period of time." The timing was not accidental. On Monday, German Chancellor Friedrich Merz had suggested that Trump's negotiating team was being outmaneuvered by Tehran, describing how Iranian officials had allowed American negotiators to travel to Islamabad only to leave empty-handed. "The Iranians are obviously very skilled at negotiating, or rather, very skilful at not negotiating," Merz said. He doubled down on Wednesday, noting that Europe was "suffering" from the consequences of Iran's closure of the Strait of Hormuz, a chokepoint through which roughly a third of the world's seaborne oil passes.
Trump responded with characteristic bluntness. On Tuesday, he accused Merz of being comfortable with Iran possessing nuclear weapons and said the chancellor "doesn't know what he's talking about." Merz, for his part, tried to smooth things over on Wednesday, insisting his relationship with Trump remained "as good as ever." But the president's threat to withdraw troops suggested otherwise—and it arrived at a moment when the entire NATO alliance was already under strain.
The broader context makes the threat more than a passing jab. In early April, Trump had said he was "absolutely without question" considering withdrawing from NATO altogether because European allies had not sufficiently supported the American-Israeli campaign against Iran or helped secure the Strait of Hormuz. While formal withdrawal from the alliance would require either a two-thirds Senate majority or an act of Congress—a barrier created by legislation passed in 2024—experts have noted that Trump could achieve similar damage through other means. Withdrawing troops from Europe would be one such path, undermining the security guarantees that have anchored European defense for nearly eighty years without technically leaving the alliance.
The numbers involved are substantial. The United States maintains over 68,000 active-duty military personnel across Europe. Germany hosts the largest concentration: between 35,000 troops according to Congressional Research Service data from 2024, and as many as 50,000 according to German media estimates. These forces represent the backbone of American military presence on the continent and a cornerstone of European security architecture.
Trump has spent both his presidencies criticizing NATO members, accusing them of "ripping off" the United States by underspending on defense. But recent weeks have seen the rhetoric escalate into something more alarming. He has threatened to invade Greenland, called allied leaders "cowards" for refusing to help reopen the Strait of Hormuz, and suggested that Russia and Ukraine should reach "a little bit of a ceasefire"—a comment made after he spoke with Vladimir Putin. Ivo Daalder, who served as the U.S. permanent representative to NATO from 2009 to 2013, captured the moment's gravity: "It's hard to see how any European country will now be able and willing to trust the United States to come to its defence."
Experts have begun describing this period as the worst crisis NATO has ever faced. The alliance was built on the premise of American commitment to European security. That premise now appears negotiable. Even as Secretary of State Marco Rubio was speaking with his German counterpart about the importance of maintaining freedom of navigation in the Strait of Hormuz, Trump's post about reviewing troop levels suggested that commitment might depend on whether European leaders agreed with the president's approach to Iran—or simply stayed quiet.
Citas Notables
The Iranians are obviously very skilled at negotiating, or rather, very skilful at not negotiating, letting the Americans travel to Islamabad and then leave again without any result— German Chancellor Friedrich Merz
It's hard to see how any European country will now be able and willing to trust the United States to come to its defence— Ivo Daalder, former U.S. permanent representative to NATO
La Conversación del Hearth Otra perspectiva de la historia
Why does Trump care so much about what Merz said? It seems like a small criticism.
Because it was public. Merz said Trump was being outplayed, which touches something the president can't tolerate—the appearance of weakness. And he said it to the press, not in a private call.
But threatening to pull troops out of Germany seems like punishing an ally for honest disagreement.
That's exactly what it is. And that's the calculation: if you criticize me publicly, I can make you pay. It's a way of enforcing loyalty through fear.
Is there actually a chance he withdraws those 35,000 troops?
Probably not immediately. But the threat itself does damage. It makes European leaders wonder if they can count on America. That uncertainty is corrosive.
What does Germany do now?
They have to decide whether to stay quiet and hope the threat passes, or push back and risk escalation. Either way, the relationship has shifted. Trust is harder to rebuild than it is to break.
And NATO as a whole?
If the U.S. starts pulling troops from Europe, the whole structure collapses. Not overnight, but the message is clear: America's commitment is conditional. That's a fundamental break from seventy years of alliance.