FILE PHOTO: Iranian President Hassan Rouhani speaks at a news conference on the sidelines of the United Nations General Assembly in New York, U.S., September 26, 2019. REUTERS/Brendan Mcdermid/File Photo

DUBAI: Iranian President Hassan Rouhani threatened a "crushing response" on Wednesday (May 6) if the United States goes ahead with plans to extend an embargo on Iranian trade of conventional arms, which the United Nations is set to lift later this year.