Regarding the existing ceasefire, Vance said that “Ceasefires are always a little messy,” but it’s “very much holding.” WASHINGTON — U.S. and Iranian negotiators reached a tentative agreement Thursday to extend the ceasefire in the 3-month-old war by 60 days and start a new round of talks on Iran’s nuclear program, according to a U.S. official familiar with the matter. Iran did not immediately confirm any deal. Vice President JD Vance on Thursday evening confirmed there was a tentative agreement, but said it was unclear whether President Donald Trump would approve it. This story continues below. “It’s…