From the Document: "The United States is the single largest financial contributor to the United Nations (U.N.) system. Congress has long debated the appropriate level of U.S. contributions to U.N. system activities and whether U.S. funds are being used efficiently and effectively. Since 2017, the Trump Administration has proposed significant overall decreases in U.S. funding to the United Nations; however, Congress has generally funded U.N. entities at higher levels than the Administration has requested. Compared to FY2019 funding levels, the President's FY2020 budget proposed reducing U.N. peacekeeping funding by 27%, decreasing U.N. regular budget and specialized agency funding by 25%, and eliminating funding to some U.N. funds and programs."
CRS In Focus, IF10354
Congressional Research Service: https://crsreports.congress.gov/