The White House has denied a report in the New York Times saying that Iran had agreed to one-on-one negotiations over its nuclear programme with the US.
The report, quoting unnamed officials, said Iran had agreed to the talks for the first time but would not hold them until after US elections on 6 November.
The White House said it was prepared to meet Iran bilaterally, but that there was no plan to do so.
Western states think Iran is seeking nuclear weapons, something it denies.
Iran has been a key foreign policy topic in the US election campaign.