Boris Johnson is to attempt to convince US politicians not to end the nuclear deal with Iran, amid a firestorm about his remarks in regard to a British woman jailed in the country.
The Foreign Secretary is in Washington for meetings with congressional leaders.
They are due to happen after Donald Trump decertified the deal with Iran, giving the US congress the ability to impose economic sanctions on the country which had lifted after the nuclear agreement was struck.
Johnson will highlight the pressing need to maintain it, in order to ensure Iran does not begin the development of nuclear weapons.
He clarified supporting the nuclear agreement didn’t mean ignoring any “disruptive” behaviour on Iran’s part, like the “unjustified detention of British nationals.”
The Foreign Secretary is currently facing calls to quit over comments made about the case of Nazanin Zaghari-Ratcliffe, who was arrested in Iran last year.
Last week, he told an MP committee she had been training journalists – not holidaying – in the country at the time, a statement which has been vociferously denied by both her family and her employer.
The remark prompted concerns the authorities in Iran might use Johnson’s comments to impose further punishment on Zaghari-Ratcliffe.
The Foreign Secretary said on Tuesday he could have been “clearer” with his comments and apologised if they had been “misconstrued.”