However, here is something from WaPo that should help you:

The prohibition on U.S. funding of U.N. agencies that recognize a Palestinian state was included in two pieces of legislation that were signed into law by President George H.W. Bush in 1990 and President Bill Clinton in 1994.

The 1990 law prohibits the appropriation of funds “for the United Nations or any specialized agency thereof which accords the Palestine Liberation Organization the same standing as a member state.”

In 1994, Congress barred funding “any affiliated organization of the United Nations which grants full membership as a state to any organization or group that does not have the internationally recognized attributes of statehood.”


From: http://www.washingtonpost.com/world/nation...

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US Code is freely available online if you want original text.