President Trump’s decision to go to war with Iran was fueled by allies like Prime Minister Benjamin Netanyahu of Israel, who pushed the president to end diplomatic negotiations and strike a decisive blow against Iran’s theocratic government. Few of Trump’s advisers voiced opposition. Our investigative reporter Mark Mazzetti explains what led up to Trump’s official order to strike Iran. Video by Mark Mazzetti, Leila Medina, Sutton Raphael, Joey Sendaydiego, Jon Hazell and Rafaela Balster/The New