European NATO diplomats are bracing for potential escalation against the alliance if Republicans suffer losses in the U.S. midterm elections on November 3.

Five anonymous NATO diplomats told Politico that they worry a Democratic gain in Congress would constrain President Trump's domestic agenda, prompting him to focus on foreign policy where he holds greater authority as commander in chief. They specifically cited risks of additional U.S. troop withdrawals from Europe and cuts to NATO's common funding.

The concerns center on an upcoming Pentagon review of U.S. forces in Europe, due by December. Diplomats suggested that if domestic legislation stalls, Trump might expand planned reductions to appeal to his base. One senior European defense official noted that lame-duck presidents often mix frustration with foreign policy moves, and attacks on NATO fit a consistent pattern in Trump's approach.

These fears build amid recent tensions, including the U.S. cutoff of Starlink services for Ukraine and Trump's recent outreach to Russian President Vladimir Putin. Diplomats also raised possibilities of reduced U.S. contributions to alliance budgets and limits on programs supporting arms purchases for Ukraine.

The White House pushed back on the narrative. Assistant Press Secretary Olivia Wales stated that President Trump has done more for NATO than any predecessor, pointing to agreements that raised allied defense spending targets to 5 percent of GDP by 2035, expanded U.S. military presence in Greenland, and diplomatic efforts to resolve the Ukraine conflict.

Democrats are expected to win the House and possibly the Senate, while Trump's approval ratings have hit record lows. A shift in congressional control could limit unilateral executive actions on NATO but would not eliminate the president's ability to adjust troop deployments or engage directly with foreign leaders.

NATO members have already begun adjusting to reduced U.S. commitments, with some European nations increasing their own defense investments. The alliance's upcoming force posture review will test how far any post-election shifts extend.