FILE - President Jimmy Carter tenses his lips as he faces reporters at the White House in Washington on Nov. 28, 1979 to a comment on the latest situation at the U.S. Embassy in Tehran. In November 1979, a little over a week after student militants seized control of the U.S. Embassy in Tehran and took 52 American citizens hostage, President Jimmy Carter issued Executive Order 12170 declaring a national emergency against Iran. (AP Photo/Harvey Georges, File)