National security adviser: US has begun communicating with Iran over hostages

National security adviser Jake SullivanJake SullivanHillicon Valley: China implicated in Microsoft breach | White House adds Big Tech critic | QAnon unfazed after false prediction White House calls Microsoft email breach an 'active threat' The Hill's Morning Report - Presented by Facebook - Virus relief bill headed for weekend vote MORE on Sunday said the Biden administration has begun discussions with Iran regarding the American hostages the Islamic Republic currently holds.

CBS's "Face the Nation," host Margaret Brennan asked Sullivan if hostage negotiations had begun, noting that at least five American hostages are being held in Iran.

“We intend to very directly communicate with the Iranians about the complete and utter outrage, the humanitarian catastrophe that is the unjust, unlawful detention of American citizens in Iran,” Sullivan said.

“We have begun to communicate with the Iranians on this issue, yes,” Sullivan continued. “And we will continue to do so as we go forward. And our strong message to the Iranians will be that it- we will not accept a long-term proposition where they continue to hold Americans in an unjust and unlawful manner. It will be a significant priority of this administration to get those Americans safely back home.”

Brennan also asked if Tehran had responded to an offer last week from the U.S. and European Union to meet about the 2015 nuclear deal and whether the offer still stood, given that Iran had said it would reduce some access granted to the international community's nuclear watchdog.

“First, Joe BidenJoe BidenSenate holds longest vote in history as Democrats scramble to save relief bill Ex-Trump appointee arrested in Capitol riot complains he won't be able to sleep in jail Biden helps broker Senate deal on unemployment benefits MORE is intent, determined to prevent Iran from getting a nuclear weapon. Second, he believes that hardheaded, clear-eyed diplomacy is the best way to do that,” Sullivan responded, affirming that the offer to negotiate still stands.

“It is Iran that is isolated now diplomatically, not the United States. And the ball is in their court,” Sullivan said.

The Fars News Agency (FNA), Iran's semi-official news agency, after the interview shared a statement from Iran's Foreign Ministry Spokesman that shot down reports that direct talks have begun.

"We have received some messages from the Swiss Embassy regarding the exchange of prisoners," the spokesman said in a translated Tweet from FNA. "The release of Iranian prisoners in US prisons is our priority, but there has been no direct dialogue, and this is not true."

Switzerland represents the U.S.'s interests in Iran.