US Vice President JD Vance said it’s “TBD” whether President Donald Trump will sign a tentative memorandum of understanding with Iran, and that the two countries are still negotiating over “a couple of language points.”

Axar.az reports, citing CNN, while emphasizing that progress that has been made, Vance said there are a few key points on Iran’s nuclear program and enriched uranium that remain in flux.

“I think it’s hard to say exactly when or if the president is going to sign the MOU. We’re going back and forth on a couple of language points,” Vance told reporters on the tarmac at Joint Base Andrews on Thursday.

“There are a couple of issues on the nuclear stuff, the highly enriched stockpile, and also the question of enrichment. So we’re going back and forth with them. We do think they’re negotiating, at least so far, in good faith,” Vance said.

“Hopefully, we’ll continue to make progress, the president will be in a position where he can endorse the agreement, but obviously that’s still TBD.”

And he said he couldn’t yet guarantee such a deal will be reached.

“We’ll get to a point where we could potentially sit down and settle these issues, but that requires us to make a little bit more progress. I can’t guarantee that we’re going to get there, but right now I feel pretty good about it,” he said.