Anyway, the Grauniad's lead story claims:
Israel gave serious thought this spring to launching a military strike on Iran's nuclear sites but was told by President George W Bush that he would not support it and did not expect to revise that view for the rest of his presidency, senior European diplomatic sources have told the Guardian.Read whole thing.
The then prime minister, Ehud Olmert, used the occasion of Bush's trip to Israel for the 60th anniversary of the state's founding to raise the issue in a one-on-one meeting on May 14, the sources said. "He took it [the refusal of a US green light] as where they were at the moment, and that the US position was unlikely to change as long as Bush was in office", they added. . . .
Bush's decision to refuse to offer any support for a strike on Iran appeared to be based on two factors, the sources said. One was US concern over Iran's likely retaliation, which would probably include a wave of attacks on US military and other personnel in Iraq and Afghanistan, as well as on shipping in the Persian Gulf.
The other was US anxiety that Israel would not succeed in disabling Iran's nuclear facilities in a single assault even with the use of dozens of aircraft. It could not mount a series of attacks over several days without risking full-scale war. So the benefits would not outweigh the costs.