The prime minister’s official spokesman also said the government “could not be clearer about the UK’s position”, and that “sovereignty rests with the UK and the islanders’ right to self-determination is paramount”.
He continued: “We’ve expressed this position previously clearly and consistently to successive US administrations and nothing is going to change that.”
BBC News has contacted the Pentagon about the reported email and has not been able to review the document.
The Falkland Islands review was one of a number of measures suggested in the email.
Asked about the suggestion the US could push for Spain’s expulsion from Nato, an official from the military alliance said the organisation’s founding treaty “does not foresee any provision for suspension of Nato membership, or expulsion”.
Earlier, Spain’s Prime Minister Pedro Sanchez said: “We do not work based on emails. We work with official documents and official positions taken, in this case, by the government of the United States.”
