Donald Trump said on Thursday night that it was the "calm before the storm" amid reports that he will announce next week that he will “decertify” the Iran nuclear deal.

The US president earlier said that Iran had "not lived up to the spirit" of the nuclear deal.

Mr Trump summoned reporters to the State Dining Room at the White House on Thursday evening, where he was hosting a dinner with military leaders.

"You guys know what this represents?" Mr Trump asked. "Maybe it's the calm before the storm. Could be the calm, the calm before the storm."