Here are details from a September 2009 Wikileaks memo:
Our redlines for walking out of a speech, which should be conveyed to the host government, are:
-- Denying the historical reality of the Holocaust
-- Comparing U.S. or Israeli actions to those of Nazi Germany
-- Using other clearly anti-Semitic rhetoric, including suggestions (similar to those in Ahmadinejad?s 2008 UNGA remarks) that Jews or Zionists control the media and the financial system or have formed a nefarious conspiracy
-- Threatening the destruction of Israel or any other UN member state
-- Denying Israel?s or another UN member state?s right to exist
-- Suggesting that the United States deserved 9/11
-- Embracing or justifying the Lockerbie bombing
-- If asked: The U.S. will, of course, reserve the right to respond to any other obnoxious or offensive statements.