Mike Waltz is approaching his new role as U.S. ambassador to the United Nations and a mandate from President Donald Trump to cut funding for what were once longtime American priorities the same way he set about representing Florida in Congress. “I approach nearly every decision I can here with America first, with the American taxpayer first,” Waltz said virtually at a recent event at the Richard Nixon Foundation. In recent meetings with U.N. officials, including Secretary-General António Guterres, Waltz and his colleagues at the U.S. mission have made the case that the United States — the U.N.'s largest donor — will no longer be footing the bill the way it has since the world body’s founding eight decades ago.