A senior adviser to Iran’s Supreme Leader Ali Khamenei boasted Sunday the Islamic republic is now capable of building a nuclear bomb, waiting until U.S. President Joe Biden was in the air and flying home from his Middle East visit to make the declaration of advanced capability. “In a few days we were able to enrich uranium up to 60 percent and we can easily produce 90% enriched uranium … Iran has the technical means to produce a nuclear bomb but there has been no decision by Iran to build one,” Kamal Kharrazi told Al Jazeera’s Arabic service in a...