To limit the United States share of assessments for the United Nations regular budget.

Amends the United Nations Participation Act of 1945 to bar the use of Department of State funds to pay the U.S. share of assessed contributions for the United Nations (UN) regular budget in an amount greater than the largest assessed contribution of any other permanent member country of the United Nations Security Council (currently, an amount greater than 22 percent of the total of all assessed contributions).