Mike Waltz, the new United States ambassador to the United Nations, is leading a significant shift in American policy by adopting a selective approach to funding United Nations agencies and initiatives. Under President Donald Trump's directive, the United States is now choosing which United Nations operations to support based on alignment with American interests, departing from decades of broad financial backing. This move has already resulted in major budget and staffing cuts within the United Nations, including a substantial reduction in peacekeeping forces and humanitarian aid. United Nations officials and analysts warn that these changes could fundamentally alter the organization's ability to deliver on its global mandates, as no other country has stepped in to fill the financial gap left by the United States. Despite the cuts, Waltz emphasizes that the United States will maintain its presence and influence at the United Nations, especially in areas of strategic competition with China, while continuing to press for reforms and greater transparency.