The EU's chief diplomat Federica Mogherini

The EU's chief diplomat Federica Mogherini announced Monday she will visit Washington early next month to defend the Iran nuclear deal after US President Donald Trump threatened to tear it up.

Mogherini said she would "be in Washington in early November" to urge US lawmakers not to pull out of the landmark 2015 deal curbing Tehran's nuclear programme in return for the lifting of punitive sanctions