[U.S. Defense Secretary: Iran Nuclear Deal Likely to Be Signed on Sunday] BlockBeats News, June 14, U.S. Defense Secretary Hegseth: We are on track to sign the agreement with Iran. The question is not whether we will sign it, but when. The Iran nuclear deal is likely to be signed on (local time) Sunday. I do not believe Israel's strike on the southern suburbs of Beirut will hinder reaching an agreement with Iran.