Chris Hegadorn made the appeal today at the agency's Paris headquarters in one of the last major American speeches to UNESCO before the US withdraws next year.
Hegadorn said the decision to leave "wasn't taken lightly" but was necessary because of budget reasons, UNESCO's inclusion of Palestine as a member and countries using the agency to advance their political agendas.
He urged UNESCO to speed up spending decisions and do more to prevent violent extremism through education, notably on social media.
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