In this May 9, 2007 file photo, Venezuelan Ambassador Bernardo Alvarez Herrera speaks about United States and Venezuela relations at the World Affairs Council in San Francisco. The Obama administration revoked Bernardo Alvarez Herrera's visa on Wednesday, Dec. 29, 2010 in a tit-for-tat diplomatic response to Venezuela's rejection of the U.S. choice to be the next envoy to the South American country. (AP Photo/Paul Sakuma, File)
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