Article continues below advertisementPresident Donald Trump is projecting confidence that the U.S. war with Iran will wrap up quickly - but experts say the messaging around the conflict reveals how difficult it is to predict the trajectory of a rapidly evolving military campaign.Speaking to Republican lawmakers and donors this week in Florida, Trump framed the conflict as a limited operation nearing completion."We took a little excursion because we felt we had to do that to get rid of some evil," Trump reportedly said. "And I think you'll see it's going to be a short-term excursion.