The sources noted it would likely be a joint U.S.-Israeli campaign that's much broader in scope — and more existential for the regime — than the Israeli-led 12-day war.

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The Israeli government — which is pushing for a maximalist scenario targeting regime change as well as Iran's nuclear and missile programs — is preparing for a scenario of war within days, according to two Israeli officials.

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"The boss is getting fed up. Some people around him warn him against going to war with Iran, but I think there is 90% chance we see kinetic action in the next few weeks," one Trump adviser said.