Trump tweets creating 'chaos politics': Kerry

President Donald Trump has created a destructive atmosphere of "chaos politics" with his prolific use of Twitter for policy announcements and incendiary remarks alike, former secretary of state John Kerry has said.

In an interview with Swiss public broadcaster RTS in Geneva yesterday, Kerry slammed Trump's frequent and often controversial tweets.

"More and more Americans are finding the tweet phenomenon tiring, destructive and interruptive of the genuine kind of dialogue," he said.

"I think it creates a chaos politics, and that's not good," he added.

Trump has used Twitter as a platform to announce major shifts in both domestic and foreign policy, to criticise allies, taunt US adversaries and threaten North Korea.

"It is without precedent, this kind of chaotic presidency. I can't think of any time it has been seen in modern times," the former secretary of state said.

Kerry, who served as the top US diplomat for four years under former President Barack Obama, was particularly critical of Trump's tweets publicly chastising current Secretary of State Rex Tillerson.

Earlier this month, the president for instance took to Twitter to accuse the former ExxonMobil CEO of "wasting his time" trying to negotiate with North Korea.

Such tweets are "very, very unproductive, very counter- productive," Kerry said.

"I think it is very difficult to be a secretary of state when the president is undermining you very publically, as he has been," he added.