The Obama administration’s effort to reach a final nuclear agreement with Iran is expected to slip past its deadline Tuesday, though U. S. officials expressed confidence a deal is within reach.“At this point, I would anticipate the negotiations will extend past the deadline, ” White House press secretary Josh Earnest told reporters Monday, said a report appeared on the Hill, a top political website read by the White House and more lawmakers. “Our negotiators will remain in Vienna past the deadline in pursuit of a final agreement, ” IRNA reported.Recommended:Netanyahu vows to stop Iran nuclear programEarnest declined to handicap the chances of reaching a deal, but said a final agreement ' is within our sights. ' “I would hesitate to put numbers on it at this point, ” he said. “Obviously our negotiators understand the stakes in the negotiations. ” The administration previously aimed to have a final agreement completed by June 30, capping off a nearly two - year effort to curb Iran’s nuclear program. Foreign Minister of Iran Mohammad Javad Zarif on Sunday held bilateral and intensive talks in Vienna with the US State Secretary John Kerry, the European Union ' s Foreign Policy Coordinator, Federica Mogherini, German Foreign Minister, Frank - Walter Steinmeier, French Foreign Minister, Laurent Fabius, and Chinese Vice Foreign Minister Li Baodong, after talks with the UK Foreign Secretary Philip Hammond. On Monday he retruned to Tehran on a pre - planned schedule.Read Also:Iran to take ‘corresponding action’ if nuclear deal fails, Zarif Informed observers in Vienna believe that there is possibility of a deal in case of the West’s flexibility and refusal to push for excessive demand. The nuclear talks in Vienna have faced several last-minute stumbling blocks, including the pace of sanctions relief and the scope of inspections on Iran’s nuclear sites, the Hill said in its report. Earnest said US negotiators are willing to talk for a few more days. He noted the lapse is not unusual. Talks over a preliminary agreement were slated to end March 31 but instead were completed on April 2. It is unclear how much longer the talks will last, but observers see July 9 as the real cutoff date to strike a deal. If an agreement is presented to Congress before July 9, lawmakers will have only 30 days to review it before Obama can begin lifting sanctions on Iran imposed by Congress, under a bill passed in May. But if it is filed after, the review period jumps to 60 days. Supporters of the deal fear that a longer review process could allow opponents more time to mobilize to kill the deal in Congress.