Vice President JD Vance will lead a U.S. delegation for another round of talks with Iran in Islamabad before the ceasefire is scheduled to end on Tuesday night, two U.S. officials tell Axios. Why it matters: The talks could provide an eleventh hour opportunity to reach a deal, or at least extend the ceasefire — though Iran has yet to confirm its participation and is concerned this is all subterfuge from the White House. Driving the news: In a brief call with Axios on Sunday, President Trump expressed optimism about the purported talks. "I feel fine about it. The concept of the deal is done. I think we have a very good chance to get it completed," he said. Earlier on Sunday, Trump had said his envoys Steve Witkoff and Jared Kushner would depart for Pakistan on Sunday, but didn't mention Vance. Yes, but: Iranian officials, on the other hand, are lowering expectations and appear suspicious that Trump's talk of a deal could be cover for a U.S. surprise attack.…