UNITED NATIONS — Iran has formally protested Washington’s refusal to grant a visa to its new UN ambassador, saying the move damages international diplomacy and sets a “dangerous” precedent.

The US State Department and White House have said that Iran’s selection of Hamid Aboutalebi to be its United Nations envoy is not acceptable. Aboutalebi was a member of the group responsible for the 1979 takeover of the US Embassy in Tehran that held 52 Americans hostage for 444 days. Aboutalebi has insisted his involvement in the group was limited to translation and negotiation.

Iran’s UN Mission sent a delegation to meet with the United Nations’ office of Legal Affairs on Tuesday afternoon about the issue, UN spokesman Stephane Dujarric said.

The Iranian Mission filed a letter with the UN’s Committee on Relations with the Host Country and released a copy of it Monday night.

The 19-nation Host Country committee, chaired by Cyprus, can hold a hearing on the issue but cannot change the US decision. The United States is one of the members of the committee, which is expected to meet next on April 22.

Iran’s letter said the United States was breaching its obligations under the US-UN Host Country Agreement, which is a treaty and US law that generally requires the host country to allow access to diplomats and UN guest speakers.

“The Agreement has unambiguously stated that its provisions shall be ‘applicable irrespective of the relations existing between the Governments of the persons referred to in that section and the Government of the United States,'” the Iranian letter said.

“This decision of the US Government has indeed negative implications for multilateral diplomacy and will create a dangerous precedence and affect adversely the work of intergovernmental organizations and activities of their Member-States,” said the Iranian letter to the committee and to Secretary-General Ban Ki-moon.

The United States has said there are loopholes in the agreement that allow it to refuse a visa to people considered a danger to the United States, or who have been involved in terrorist activities.

State Department spokeswoman Jen Psaki on Tuesday reiterated that the U.S. deems Aboutalebi’s nomination “unacceptable.”

“And while we’re not going to get into any specifics of what we do or don’t think he was involved in during the hostage crisis, he himself has said he was involved, and given his role in the events of 1979, which clearly matter profoundly to the American people, it would be unacceptable for the United States to grant this visa,” Psaki said.

A new law passed last week by Congress, but so far not signed by US President Barack Obama, would bar Aboutalebi on the grounds of his alleged terrorist connections.

In 1988 the United States refused PLO chairman Yasser Arafat a visa to speak at the General Assembly, in part citing as precedent its refusal of visas throughout the 1980s to proposed Iranian diplomats who were linked to the UN Embassy takeover.

Copyright 2014 The Associated Press.