The US Senate passed legislation on Monday seeking to bar Iran's proposed UN Ambassador, Hamid Abutalebi, from entering the United States.
The legislation, introduced by Texas Republican Senator Ted Cruz, would prevent "known terrorists" from entering the United States to serve as UN Ambassadors.
The Senate passed the measure by voice vote.
The possibility that Abutalebi may have played a role in the 1979-1981 hostage crisis has outraged some of the U.S. embassy workers held by the Iranians for 444 days.
Several lawmakers had said they were infuriated that Iranian President Hassan Rouhani would make such a choice, and the State Department had expressed concern.