Donald TrumpDonald John TrumpBrennan fires new shot at Trump: ‘He’s drunk on power’ Trump aides discussed using security clearance revocations to distract from negative stories: report Trump tried to dissuade Melania from 'Be Best' anti-bullying campaign: report MORE opened up a Thursday campaign rally by saying he'll accept the results of the presidential election as long as he wins.

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"I will totally accept the result of this great and historic presidential election," Trump told supporters in Delaware, Ohio. 

He then paused dramatically. 

"If I win."

The crowd went wild.

Later in the speech, Trump said that he would accept a "clear election result," leaving the door open to conceding the race if Hillary ClintonHillary Diane Rodham ClintonMueller recommends Papadopoulos be sentenced to up to 6 months in prison Poll: Dem opponent leads Scott Walker by 5 points Cuomo fires back at Trump: 'America is great because it rejects your hate-filled agenda' MORE wins by an overwhelming margin.

"I would accept a clear election result but I would also reserve my right to contest or file a legal challenge in the case of a questionable result," Trump told his crowd. 

"And always, I will follow and abide by all of the rules and traditions of all of the many candidates who have come before me." 

"Bottom line," he added to cheers, "we are going to win."

The Republican nominee has faced a backlash for declining to say at Wednesday's night's debate that he would accept the results of the election. He said he would keep the country in “suspense.”  

As Trump falls in the polls, he has taken to telling supporters that the media and widespread voter fraud are "rigging" the election against him.

At Thursday's rally, Trump said the only reason he won't accept the results in advance is because he's convinced Clinton is cheating.

"We want fairness in the election," he said. "Don't be naive folks."

"A campaign like Clinton's that will incite violence is truly a campaign that will do anything to win," he said.

The Republican said Clinton is the most corrupt and dishonest person ever to run for president.

"It was in that context that I was asked, in advance, to concede the results on election night, if for some reason we should lose," he said, referring to the debate. "That was sort of an unprecedented question."

Trump said that if Democratic nominee Al GoreAlbert (Al) Arnold GoreOvernight Energy: EPA questioned safety of rolling back fuel efficiency rule | Zinke blames 'environmental terrorist groups' for wildfires | Illinois sues Chicago Trump hotel for violating water rules Al Gore: Trump has had 'less of an impact on environment so far than I feared' The Hill's Morning Report — Trump to GOP: I will carry you MORE or Republican nominee for president, George W. Bush, had agreed to the same question three weeks before the 2000 election, there would have been no Supreme Court case contesting the recount in Florida. 

"In effect I'm being asked to wave centuries of legal precedent," Trump said, "designed to protect the voters."

That argument isn't sitting well with some Republicans.

Sen. John McCainJohn Sidney McCainThe Hill's 12:30 Report Senate gets to work in August — but many don’t show up Rand Paul’s Russia visit displays advancement of peace through diplomacy MORE (R-Ariz.), who withdrew support from Trump earlier this month, issued a lengthy statement Thursday saying the loser of the election has a “duty to concede” the race.

Recalling his own "reluctant" concession of the 2008 race to President Obama, McCain said accepting the results "isn’t just an exercise in graciousness."

"It is an act of respect for the will of the American people, a respect that is every American leader’s first responsibility. ... This election must not be any different." 

It seems unlikely that such statements will convince Trump to change his rhetoric.

Returning to the argument that the race is rigged in Clinton's favor, Trump pointed to emails released by WikiLeaks that suggested that Democratic National Committee interim chair Donna Brazile shared a CNN town hall question with the Clinton campaign in advance during the Democratic primaries. Brazile has denied sharing a question with the campaign.

"She should resign," Trump said of Brazile. "How can a woman do that? That is cheating at the highest level." 

"But I ask you, why shouldn't Hillary Clinton resign from the race?" he continued. "She was given these questions. She used these questions, studied these questions, got the perfect answer for the questions. 

"That is very dishonest," he added. "This is even bigger because we are going for the presidency of the United States."

Trump joked that if it were discovered that he received questions in advance "they would call for the re-establishment of the electric chair." 

- Updated at 1:26 p.m.