U.S. Ambassador to the United Nations Mike Waltz said that while he didn’t want to get ahead of an announcement, President Donald Trump still “has every intent for” the preliminary framework of a peace deal with Iran to be signed Sunday.

“How will this [signing] work, and how confident are you that it will happen today?” asked ABC’s “This Week” co-anchor Martha Raddatz.

“Well, the president has every intent for it to happen. I’ll leave the actual details and timing to the White House. The Iranians are incredibly difficult negotiators, coupled — coupled with the fact that they’re having a very hard time getting guidance from their supreme leader, and they’re not always on the same page within their team,” Waltz said.

But still, the ambassador insisted Trump and U.S. negotiators are “confident” the deal will happen.

“They have every intent of getting this done today,” he said.

U.S. officials and Iranian officials have signaled a deal to reopen the Strait of Hormuz and negotiate remaining issues regarding Iran’s nuclear program over a 60-day period. But while Trump said a signing would occur on Sunday, Iran has not confirmed that timeline; a spokesperson for Iran’s foreign ministry said Saturday there was a high possibility the memorandum of understanding is finalized in the coming days.

This is a developing story. Please check back for updates.