Donald Trump's vow to renegotiate nuclear deal rejected by Iran

Iran's foreign minister says the nuclear deal reached last year with world powers cannot be renegotiated despite Republican presidential contender Donald Trump's pledge to do so if elected.

After a lecture in Stockholm on Wednesday, Mohammad Javad Zarif said the deal "is not an Iran-US agreement for the Republican front-runner or anybody else to renegotiate. It's an international understanding annexed to a Security Council resolution."