The United States and Iran have agreed in principle for the first time to one-on-one negotiations over Iran’s nuclear program, according to Obama administration officials, setting the stage for what could be a last-ditch diplomatic effort to avert a military strike on Iran.

Iranian officials have insisted that the talks wait until after the presidential election, a senior administration official said, telling their American counterparts that they want to know with whom they would be negotiating.

News of the agreement — a result of intense, secret exchanges between American and Iranian officials that date almost to the beginning of President Obama’s term — comes at a critical moment in the presidential contest, just two weeks before Election Day and the weekend before the final debate, which is to focus on national security and foreign policy.

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