Downing Street has insisted that the sovereignty of the Falkland Islands is “not in question” following reports that the US could review Britain’s claim as revenge for a lack of support in the Iran war.

An internal Pentagon email set out options for Mr Trump’s administration to punish Nato allies for refusing to join the US-Israeli strikes against Iran.

The memo, first reported by Reuters, suggests reassessing US ‌diplomatic support for “imperial possessions” such as the Falklands.

On Friday morning, No 10 insisted that “sovereignty rests with the UK”, adding that Britain will not be “pressured on the Iran war”.

It came as Admiral Lord West of Spithead – the commanding officer of HMS Ardent , a frigate that was sunk in the Falklands conflict – told The Independent the reports were an “insult to the autonomous, self-reliant and free people of the Falkland Islands”, adding: “How dare they!”

But he also dismissed the threats, saying that, militarily, losing US support for British sovereignty would have “no…