Mitt Romney will call for an escalation of the conflict in Syria by arming rebels with the heavy weapons needed to confront president Bashar al-Assad's tanks, helicopters and fighter jets.
Romney is to make the proposal on Monday in what his campaign team has billed as a major foreign policy speech in Lexington, Virginia.
In extracts published in advance, he opened up the prospect, if he becomes president, of a US-Iranian proxy war being fought in Syria.
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