Saudi Arabia presented a new peace initiative on Monday to end the war in Yemen, which would include a nationwide.
The comments by Sullivan may indicate a disagreement among Biden administration officials on how to approach the Iranian nuclear program.
While Biden has indicated support for rejoining the deal, the administration has stated that a precondition would be full compliance by Iran with the original agreement.
Secretary of State Tony Blinken has been more skeptical of swiftly returning to the nuclear deal, saying that a U.S. return is still far off.
“Iran is out of compliance on a number of fronts. And it would take some time, should it make the decision to do so, for it to come back into compliance and time for us then to assess whether it was meeting its obligations,” he said during a news conference at the State Department on Jan. 27. “We’re not there yet, to say the least.”