Psaki stressed that Kerry's presence wasn't necessarily a sign that a deal was finalized, or even close.
"Even if the secretary travels, it’s not a prediction of the outcome," Psaki added. "These negotiations are ongoing. They still would be. There are tough issues on the table. That’s what the negotiating team is working through."
The U.S. and five other major powers are meeting this week with Iran for the third time in five weeks to work out the first stage of a comprehensive accord to rein in Iran’s controversial nuclear program in exchange for relief from crippling sanctions. After the failure to reach an accord in talks less than two weeks ago, the signals were mixed this week on whether the preliminary deal might occur this round or must await a fourth meeting.
Psaki didn't spell out the sticking points for the drafters of the agreement, though she made repeated references to the enrichment issue.
She also reiterated the U.S. government's position that so-called "core sanctions," including those related to Iranian oil exports, are not under consideration as Western nations put together a sanctions relief package for Iran. Psaki said only "reversible sanctions relief" was under consideration.
"To be very clear, what we’re working on right now is a first step. So on the enrichment front, the first step, six-month step, would include significant limits on Iran’s enrichment capabilities and existing stockpiles of uranium in order to halt the progress of Iran’s nuclear program and roll it back in key aspects," Psaki said.