Negotiators at the Iran nuclear talks are close to making a historic deal. Who do you think the 'deal' will favor?

Negotiators at the Iran nuclear talks plan to announce Monday that they've reached a historic deal capping nearly a decade of diplomacy that would curb the country's atomic program in return for sanctions relief, two diplomats told The Associated Press on Sunday.

The envoys said a provisional agreement may be reached even earlier — by late Sunday. But they cautioned that final details of the pact were still being worked out and a formal agreement must still be reviewed by leaders in the capitals of Iran and the six world powers at the talks.

Senior U.S. and Iranian officials suggested, however, there was not enough time to reach a provisional deal by the end of Sunday.

All of the officials, who are at the talks, demanded anonymity because they weren't authorized to discuss the negotiations publicly.

"We are working hard, but a deal tonight is simply logistically impossible," the Iranian official said, noting that the agreement will run roughly 100 pages.

The senior U.S. official declined to speculate as to the timing of any agreement or announcement, saying "major issues remain to be resolved."

Despite the caution, the negotiators appeared to be on the cusp of an agreement.

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