The prospect of Marine Le Pen winning the French presidency is no longer a distant possibility but a looming reality that Europe must confront. Citing ECFR data, her victory could fundamentally alter the European Union's trajectory and strain transatlantic ties. As a Washington-based analyst, I see the United States dangerously unprepared for this scenario. Le Pen's ability to surge despite a fraud conviction highlights the enduring appeal of populism in Europe. Her skepticism toward NATO and affinity for Russia pose direct challenges to U.S. foreign policy interests. European leaders should urgently develop contingency plans to mitigate the fallout. The stakes are high: a Le Pen presidency could unravel decades of European integration and weaken the Western alliance. Now is the time for proactive diplomacy, not reactive crisis management.