Reuters got the story wrong.
http://www.nytimes.com/2005/03/10/politics/10death.html?pagewanted=print&position=
"Ms. Jordan emphasized that the United States was not withdrawing from the Vienna Convention on Consular Relations itself, which gives people arrested abroad the right to contact their home countries' consulates. But the United States is withdrawing, she said, from an optional protocol that gives the International Court of Justice in The Hague, the principal judicial organ of the United Nations, jurisdiction to hear disputes under the convention.
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