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President Barack Obama addressed Donald Trump's frenzied talk of a rigged election Tuesday,Watch Officetel: Lover Friend Online telling him to "stop whining."

Speaking at a news conference at the White House, Obama said "he started whining before the game's even over," adding that Trump's assertion that the election is fixed is "not based on facts."

Trump has yet to tweet his response.

The Republican candidate's accusations of a rigged election have increased in intensity ever since the Trump tide turned several weeks ago.

With poll numbers slipping and his chance of gaining the presidency shrinking with every new leak or accusation related to that obscene 2005 hot mic tape, Trump and his surrogates have ratcheted up the talk of a media conspiracy to the delight of his hardcore supporters.

The charges are not new; Trump said "the system is rigged" back in July after the FBI recommended no charges against Clinton following an investigation into her use of an email server while she was secretary of state. However, his accusations have increased in recent weeks and he has even encouraged his supporters to monitor polling places on election day.

Obama dismissed Trump's claims further during the conference, which took place during his final State Visit of his presidency, welcoming Italian Prime Minister Matteo Renzi and his wife Agnese Landini.

"I have never seen in my lifetime or in modern political history any presidential candidate trying to discredit the elections and the election process before votes have even taken place. It's unprecedented," he added.

"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."

Obama also addressed Trump's ongoing bromance with Russian president Vladimir Putin and the Trump campaigns ties with Russia during the conference. "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," he said.