"I think it would be disastrous. It really would … First of all, for one administration to tear up an agreement that a previous administration made would be unprecedented," Mr Brennan told the BBC broadcaster.
"I think it would be the height of folly if the next administration were to tear up that agreement," Brennan added.
In July 2015, Iran and the P5+1 group of nations – the United States, the United Kingdom, France, China and Russia, plus Germany – agreed on a gradual lifting of sanctions in exchange for Tehran keeping its nuclear program exclusively for peaceful uses. The agreement took effect on January 16, after the International Atomic Energy Agency officially confirmed Iran’s compliance with the deal’s provisions.
During the 2016 US presidential election, Trump was very critical of the Iran nuclear agreement, characterizing it as one of the worst in history.
