Israeli officials had recently developed plans to attack Iranian nuclear sites in May.
Mr. Netanyahu initially pushed for an option that would have combined airstrikes with commando raids. The plan would have been a far more ambitious version of an operation Israel carried out last September, when Israeli forces flew by helicopter into Syria to destroy an underground bunker used to build missiles for Hezbollah.
In that operation, Israel used airstrikes to take out guard posts and air defense sites. Commandos then rappelled to the ground. The teams of fighters, armed with explosives and small arms, infiltrated the underground facility and set explosives to destroy key equipment for making the weaponry.
After shelving the commando idea, Israeli and American officials began discussing a plan for an extensive bombing campaign that would have started in early May and lasted more than a week.
Their supposed plan was to drop Commandos into Iran via helicopter to blow up Nuclear facilities.