Donald Trump has repeatedly proclaimed himself a nationalist and a keen supporter of an "America First" policy in world affairs. In line with this nationalist approach, he has worked to undermine the United Nations -- sharply slashing its funding and withdrawing from its key agencies, including the World Health Organization, the Human Rights Council, and UNESCO. By contrast, polls show that most Americans have a favorable view of the work done by the United Nations and its agencies and want their country to engage closely with the world organization.