Thanks for the link.

This story began its current phase with a claim that the hawks in the Israeli government were bringing important members of the government around to their view that Iran should be attacked by Israel. This, of course, raises fear among some that Iran will be attacked but not necessarily by Israel. There is reason to speculate, even among outside observers, that if Israel says  jump, that the U.S. will say,"how high?"
The following are quotes from the article that you linked to. I have altered the sequence but I don't think it alters anything of the intended story the article laid out. I might be wrong about that though so everyone should read the story and decide for themselves. There is more of interest than I have quoted. The bolding is mine.

"Washington has been warned by Israel against leaving any military action until it is too late. Western intelligence agencies say Israel will demand that the US act if it believes its own military cannot launch successful attacks to stall Iran's nuclear programme."

"They [Whitehall and defense officials] made clear that Barack Obama, has no wish to embark on a new and provocative military venture before next November's presidential election."

"The US could do this on their own but they won't.  So we [England] need to anticipate being asked to contribute. We had thought this would wait until after the US election next year, but now we are not so sure."

"British officials say that if Washington presses ahead it will seek, and receive, UK military help for any mission, despite some deep reservations within the coalition government."