Fears of a wider war were growing on Tuesday after President Trump called for Iran’s “unconditional surrender,” cited the possibility of killing Iran’s supreme leader and referred to Israel’s war efforts with the word “we” — all apparent suggestions that the United States could enter the war against Iran.

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Should the United States join the war, Iran has prepared missiles and other military equipment for possible retaliatory strikes on U.S. bases in the Middle East, according to American officials who have reviewed intelligence reports.