"There are global consequences for arguments that are made by domestic politicians. In the same way that the President has sought to reassure the American public that he does not believe Mr Trump will be elected president...," White House Press Secretary Josh Earnest told reporters.

Responding to questions from reporters on Trump's campaigning style, Earnest said Obama has said on a couple of occasions in public that he does not believe that Trump will be elected President or Commander-in-Chief.

"There's no denying that one of the reasons there is so much energy at these events is that you have an aspiring political leader inflaming tensions and appealing to people’s darker impulses, and trying to capitalise on their anxieties to provide energy to his campaign," he said.

"And that is certainly not the approach that President Obama has taken throughout his campaigns. The President certainly does not believe that that is a tactic that political leaders in this country should support," he said.

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