Iran urged the US Congress on Wednesday to issue a “political statement” that Washington will stay committed to a possible agreement in Vienna talks to restore the 2015 nuclear deal. The accord offered Tehran sanctions relief in exchange for curbs on its nuclear programme, but then US president Donald Trump unilaterally withdrew from it in 2018 and reimposed heavy sanctions. Iran’s Foreign Minister Hossein Amir-Abdollahian urged the US guarantee on the so-called Joint Comprehensive Plan of Action in an interview with the Financial Times published on his ministry’s website. “As a matter of prin…