Israel won’t tell anyone before attacking Iran, if they do so. The United States will not be included in this action and they could be blamed for it as well.
From the Associated Press, via HuffingtonPost:
Israeli officials say they won’t warn the U.S. if they decide to launch a pre-emptive strike against Iranian nuclear facilities, according to one U.S. intelligence official familiar with the discussions. The pronouncement, delivered in a series of private, top-level conversations, sets a tense tone ahead of meetings in the coming days at the White House and Capitol Hill.
Israeli officials said that if they eventually decide a strike is necessary, they would keep the Americans in the dark to decrease the likelihood that the U.S. would be held responsible for failing to stop Israel’s potential attack. The U.S. has been working with the Israelis for months to persuade them that an attack would be only a temporary setback to Iran’s nuclear program.
Wadah Khanfar, the former director general of Al Jazeera, says an attack on Iran would be a “disaster.”