After a marathon negotiation, Vice President JD Vance left Pakistan late Saturday without a deal with Iran and declared that the United States had offered its “final and best offer” to Tehran.

“We go back to the United States having not come to an agreement,” Vance said. “They have chosen not to accept our terms.”

Vance told a press conference that American officials negotiated in good faith for 21 hours, and now it is up to Iran to decide whether to accept the final terms approved by President Donald Trump.

“We leave here with a very simple proposal, a method of understanding that is our final and best offer,” Vance said. “We will see if the Iranians accept it.”

The specifics of what the United States offered were not immediately released.

But Vance made clear Iran had not yet agreed to Trump's "central goal," which is abandoning development of nuclear weapons.

"We haven’t seen that yet,” Vance said.

Trump told reporters before the talks broke down he believed the United States was in a win-win position.

"Regardless of what happens, we win. We totally defeated that country. And so let's see what happens. Maybe they make a deal. Maybe they don't," the president continued.

"Whether we make a deal or not makes no difference to me," he added.