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President Barack Obama rebuked Donald Trump's claims that the upcoming presidential election is "going to be rigged."
During his pre-vacation news conference (he will be heading off to Martha's Vineyard for two weeks), Obama unleashed a string of criticisms on the GOP nominee and appeared irritated as he addressed the business mogul's complaints about the political system.
"Of course the election won't be rigged. What does that mean?" Obama, 55, told reporters at the news conference on Thursday.
"If Mr. Trump is suggesting that there is a conspiracy theory that is propagated across the country, including in places like Texas where typically it is not Democrats who are in charge of voting booths, that's ridiculous."
He added: "That doesn't make any sense."
The rebuke comes just days after Trump, 70, told voters in Ohio on Monday that he has heard "more and more" that the upcoming election will be rigged.
"I'm afraid the election's going to be rigged. I have to be honest," he said at the rally. "Because I think my side was rigged – if I didn't win by massive landslides."
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Trump finds himself trailing Democratic opponent Hillary Clinton by 10 percentage points, a new Fox News poll shows. Obama has criticized Trump in the past, and praised Clinton during his address at the Democratic National Convention.
Obama said he has never heard of someone complaining about "being cheated before the game was over."
"If Mr. Trump is up 10 or 15 points on Election Day and he ends up losing, then, you know, maybe he can raise some questions," Obama said. "That doesn't seem to be the case at the moment."
He added: "I think all of us at some points in our lives have played sports or maybe just played in a schoolyard or sandbox, and sometimes folks if they lose, they complain they got cheated."
Trump seemed to address Obama's comments in a tweet, writing, "President Obama should ask the DNC about how they rigged the election against Bernie [Sanders]."
The president urged voters to listen to Trump and "make your own judgment" about the 70-year-old's ability to "manage things like our nuclear triad."
"This is serious business," he said.
As for his personal opinion on the candidate: "I think I've said enough about that."
"I obviously have a very strong opinion about the two candidates who are running," he said at the conference. "One is very positive. And one is not so much."