Crown Prince Mohammed bin Salman pressed President Trump earlier to cripple Iran. But as Iran asserted its power, the prince urged a cease-fire, and is now pursuing his security priorities.President Trump and his military commanders were in a bind.They had announced the start of a new mission to help guide commercial ships through the Strait of Hormuz, which Iran had effectively closed early in the war. U.S. naval and air power would ward off any Iranian attacks during a tentative cease-fire, the commanders said.But U.S. Central Command was caught by surprise when officials from Saudi Arabia said American forces could...