umm...there may be a reason why we're not appearing as united with Europe on this...

White House upset that Brown is not war-mongering.

The Bush administration is reportedly “losing patience with Gordon Brown over Iran, with senior American diplomats frustrated by his reluctance to declare bluntly that the Islamic state must never be allowed nuclear weapons.” A State Department official says: “It would be helpful if he took a tougher line in public. … We need Iran, and the rest of the world, to realise that this is not just a bunch of crazy Americans on the one side and flaky Europeans on the other - that we are united on this one.”

(Think Progress)
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I think everyone other than "crazy Americans" think that this is a bad idea - that could explain why we don't appear united...