The prime minister said the deal remained the best means of preventing Iran from developing nuclear weapons

Theresa May threw her weight behind the Iran nuclear deal at a United Nations security council meeting chaired by President Trump yesterday, underscoring their deep divisions over the landmark agreement.

Moments after Mr Trump decried the “horrible, one-sided deal”, Mrs May insisted it “remains the best means of preventing Iran developing a nuclear weapon and we are committed to preserving [it]”.

Shortly afterwards, she addressed the UN general assembly with a speech celebrating international co-operation and the rule-based international order in direct contradiction to Mr Trump’s attack on global governance a day before.

Mrs May warned that the “natural patriotism that is the cornerstone of a healthy society” should not become “warped into a dangerous nationalism” and that pride in one’s own country “does not