London, May 7: UK Foreign Secretary Boris Johnson has urged US President Donald Trump not to abandon the Iran nuclear deal, saying “it would be a mistake to walk away”. Johnson, who is currently travelling to the US, made the remarks in a New York Times editorial published on Sunday. Trump, a fierce critic of the deal, has until May 12 to decide if he will again waive sanctions against Iran in exchange for limitations on its nuclear ambitions. In January, the last time he signed off on the pact, the President warned that it faced a “last chance”. Trump has called for stricter measures, including curbing Iran’s access to ballistic missiles.