The White House doesn't expect an agreement to end the war with Iran Sunday and thinks it could take several days for the deal's approval by Iran's leadership, including Supreme Leader Mojtaba Khamenei, a senior U.S. official said in a briefing with reporters. Why it matters: While U.S. officials are optimistic that a deal will be signed within days, they also acknowledge it has not been finalized and could still fall apart. "We are in a very good place — but there are ways in which the deal can be undermined," a senior U.S. official said. The deal would avoid an escalation of the war and decrease the pressure on the global oil supply. However, it's unclear whether it will lead to a lasting peace agreement that also addresses President Trump's nuclear demands. Trump told his "representatives not to rush into a deal" with Iran, he announced Sunday on Truth Social , saying "both sides must take their time and get it right." He said the U.S.…