A U.S. official walked out of the United Nations-sponsored Conference on Disarmament in Geneva on Tuesday after a representative from the elected government of Venezuela assumed the rotating chairmanship of the forum.

Robert Wood, the American disarmament ambassador, told reporters after leaving the conference that U.S.-backed Venezuelan opposition leader Juan Guaidó “should be in this body, should be sitting in that chair right now.”

“The former Maduro regime is in essence dead, it just doesn’t want to lay down,” said Wood, who announced the U.S. will be boycotting the conference as long as Venezuela ambassador Jorge Valero is chairing it.

According to Reuters, Argentina, Brazil, and Chile—which joined the U.S. in recognizing Guaidó as Venezuela’s “interim president”—are also boycotting the forum, which was designed to promote negotiations on nuclear disarmament and other arms control matters.

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