Question

What happens if the UN invites someone to New York but the US does not issue a visa?

Answer 1

The United States, as the host country of the UN Headquarters, is generally expected to facilitate entry for people officially invited to UN meetings under the Headquarters Agreement. If it refuses a visa, the UN can protest, negotiate with the US and invoke the relevant international obligations. However, the UN has no independent border force to compel entry. The person may be unable to attend physically, may participate through an alternative arrangement, or the meeting may be shifted or conducted virtually. Such a refusal can create a diplomatic dispute between the UN and the host country.