The director of the CIA has warned US President-elect Donald Trump that ending the Iran nuclear deal would be “disastrous” and “the height of folly.”

In a BBC interview, John Brennan also advised the new president to be wary of Russia’s promises, blaming Moscow for much of the suffering in Syria.

In his campaign, Mr Trump threatened to scrap the Iran deal and also hinted at working more closely with Russia.

Mr Brennan will step down in January after four years leading the CIA.