"Stop whining," President Barack Obama rebuked Donald Trump on Tuesday, speaking out as seldom before on next month's election and chiding the Republican for sowing suspicion about the integrity of America's presidential vote.

Obama also accused Trump of cozying up to Russia's Vladimir Putin to a degree "unprecedented in American politics."

The president said Trump's intensifying pre-emptive warnings about voter fraud are unheard of in modern politics. The rhetoric is not based on any evidence, Obama said, but is simply aimed at discrediting the outcome before the first votes are counted.

"You start whining before the game is even over?" Obama said at a Rose Garden news conference. "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."... Read More: Chicago Tribune