The US President Barack Obama said to the Republican presidential candidate Donald Trump to "stop whining" as he rejected his claim that next month's White House election will be rigged.

Mr Trump's attempt to discredit a poll before it has even taken place was "unprecedented" for a US presidential candidate, he said.

Also "unprecedented", said Mr Obama, was the Republican candidate's "flattery" of Russia's president.

The New York Billionaire is facing sinking poll numbers and accusations of sexual assault.

The businessman-turned-politician has claimed the 8 November election will be "absolutely rigged" for Democratic candidate Hillary Clinton.

On the other hand, Mr Obama said alongside visiting Italian Prime Minister Matteo Renzi, that, his assertions were "based on no facts".

"I'd advise Mr Trump to stop whining and try to make his case to get votes," Mr Obama said.

"By the way," he added, "(it) doesn't really show the kind of leadership and toughness that you want out of a president, if you start whining before the game's even over.”

"If whenever things are going badly for you and you lose you start blaming somebody else, then you don't have what it takes to be in this job."

Addressing the Republican candidate's admiring remarks about Vladimir Putin, Obama said, "Mr Trump's continued flattery of Mr Putin and the degree to which he appears to model much of his policies and approach to politics on Mr Putin is unprecedented."

Also Read: Several women say Trump assaulted them!

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