US Vice President JD Vance has said that mistrust between Iran and the United States can't be resolved overnight.
But Iranian negotiators wanted to make a deal, he said on Tuesday evening.
Earlier on Tuesday, President Donald Trump suggested talks between Iran and the US could resume within the next two days.
Vance led the US delegation in the first round of talks last weekend in Pakistan. The talks ended in apparent failure after less than a day.
On Tuesday, however, Vance said he felt "very good about where we are."
"There is a lot of, of course, mistrust between Iran and the United States of America. You are not going to solve that problem overnight," Vance said.
Vance also said that Trump didn't want to make "a small deal," but a "grand bargain."
According to Vance, Trump was telling Iran: "If you guys commit to not having a nuclear weapon, we are going to make Iran thrive."
The deal would make Iran "prosper and join the world economy," the US vice president said.
