Pentagon officials are trying to prepare for all of the ways Iran could retaliate, as President Trump hints at what he might do.

Israeli aerial bombardment has wiped out much of Iran’s ballistic missile capability and decapitated its military command, but Supreme Leader Ali Khamenei has refused to stop fighting, even promising “irreparable damage” to the US if it intervenes in the conflict in support of its staunch ally.

Iran could shut the Strait of Hormuz as a way of hitting back against its enemies, a senior lawmaker said on Thursday, though a second member of parliament said this would only happen if Tehran's vital interests were endangered.