US ambassadors have taken a chainsaw to the United Nations budget as part of President Trump’s mandate to have the world organization “get back to basics.” US Ambassador to the UN Mike Waltz and Management and Reform Ambassador Jeffrey Bartos told The Post they helped reduce the entire UN budget by $570 million — and America’s portion of that payment to the international governing body by around $126 million. “The UN has agreed to the first real budget cuts – actual real cuts for the first time in modern history, pretty much since the founding of the organization,” Waltz recently...