A member of the United States Congress, Raja Krishnamoorthi, has warned Donald Trump that any attempt to withdraw the United States from NATO without congressional approval would violate federal law and pose serious risks to national security.
In a letter sent on Wednesday, Krishnamoorthi expressed “deep concern” over Trump’s recent remarks questioning US participation in the alliance. The letter followed a closed-door meeting at the White House between Trump and NATO Secretary General Mark Rutte, which has drawn attention amid growing tensions over the future of transatlantic cooperation.
The Democratic lawmaker emphasized that Congress has already enacted binding legislation preventing any US president from unilaterally withdrawing from NATO. Under current law, such a move would require either the approval of two-thirds of the Senate or authorization through an act of Congress.
“Any unilateral U.S. exit from NATO would be both strategically reckless and blatantly illegal under current law,” Krishnamoorthi wrote. “Moreover, your rhetoric on this issue risks strengthening our adversaries at the expense of our own security.”
He further warned that even raising doubts about the United States’ commitment to NATO could weaken the alliance’s deterrent power, particularly at a time of heightened global instability. According to Krishnamoorthi, consistent US support is critical to maintaining confidence among allies and discouraging potential adversaries.
“I strongly urge you to reverse course and recognize the clear requirements of U.S. law,” he added. “We must strengthen—not weaken or question—the alliances that have preserved peace and security for generations.”
The warning comes amid renewed debate over NATO’s role following recent geopolitical developments, including tensions linked to the conflict involving the United States, Iran, and Israel. President Trump has been openly critical of the alliance, stating on Wednesday that NATO failed to support the United States during its war with Iran.
Earlier, White House spokeswoman Karoline Leavitt reinforced the administration’s stance, telling reporters that Trump believes NATO was “tested, and they failed” during the conflict.
Krishnamoorthi’s letter underscores growing concern among some US lawmakers about the potential consequences of weakening ties with NATO, a military alliance that has been central to Western security for decades. Analysts note that any move to exit or significantly distance the United States from the alliance could have far-reaching implications for global stability and US foreign policy.
As tensions continue over the administration’s position, the issue is likely to remain a focal point in Washington, with Congress asserting its authority over decisions that could reshape the country’s longstanding international commitments.
