Nerves frayed at the White House after senior officials learned Israeli aircraft had flown in and out of Iran in what some believed was a dry run for a commando raid on the site. Worried that Israel might ignite a regional war, the White House sent a second aircraft carrier to the region and readied attack aircraft, a senior U.S. official said, “in case all hell broke loose.”

The two countries, nursing a mutual distrust, each had something to hide. U.S. officials hoped to restrain Israel long enough to advance negotiations on a nuclear deal with Iran that the U.S. had launched in secret. U.S. officials saw Israel’s strike preparations as an attempt to usurp American foreign policy.

Instead of talking to each other, the allies kept their intentions secret. To figure out what they weren’t being told, they turned to their spy agencies to fill gaps. They employed deception, not only against Iran, but against each other. After working in concert for nearly a decade to keep Iran from an atomic bomb, the U.S. and Israel split over the best means: diplomacy, covert action or military strikes.

Personal strains between President Barack Obama and Israeli Prime Minister Benjamin Netanyahu erupted at their first Oval Office meeting in 2009, and an accumulation of grievances in the years since plunged relations between the two countries into crisis.