"US Secretary of State Rex Tillerson pauses while speaking to the press at the Hilton Midtown about an earlier P5+1 meeting on the Iran Nuclear deal at the United Nations headquarters during the 72nd United Nations General Assembly on September 20, 2017 in New York City. US Secretary of State Rex Tillerson said Wednesday he had had a matter of fact exchange with his Iranian counterpart Mohammad Javad Zarif but that Washington continues to have ""significant issues"" with the Iran nuclear deal.  / AFP PHOTO / Brendan Smialowski        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)"