With just 48 hours to meet the deadline for an Iran nuclear deal, U.S. Secretary of State John Kerry announced Sunday that negotiations at this point "could go either way" and that "we have difficult issues still to resolve."

"We are not yet where we need to be on several of the most difficult issues," Kerry said. "And the truth is that while I completely agree with [his Iranian counterpart] Foreign Minister Zarif that we have never been closer — at this point, this negotiation could go either way."

Kerry sat down with Iran's Foreign Minister Mohammad Javad Zarif Sunday morning in Vienna for talks, taking only a 30-minute break before resuming meetings in the early afternoon.

"If hard choices get made in the next couple of days, and made quickly, we could get an agreement this week," said Kerry. "But if they are not made, we will not."

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