NATO Secretary General Mark Rutte said U.S. President Donald Trump was “clearly disappointed” that allies did not join the U.S. in its conflict with Iran.

The remarks followed a closed-door meeting in Washington described as frank, coming amid tensions between the United States and NATO over support during the war and broader alliance responsibilities.

Donald Trump has criticized NATO as insufficient and suggested the U.S. could reconsider its role, though legal restrictions limit withdrawal without congressional approval.

The discussions took place alongside a fragile ceasefire agreement and ongoing negotiations involving reopening the Strait of Hormuz, a key global oil route, The Guardian has reported.

Despite past cooperation, disagreements over burden-sharing and military support have strained relations between the United States and its NATO allies.