"Tonight, for the sake of our unity as a people and the strength of our democracy, I offer my concession", he said.
Mr Trump told the OH audience that the election "is having nothing to do with [him] but having to do with the fairness of our country".
But the NY billionaire plowed ahead anyway, paying no heed.
"Donald thinks belittling women makes him bigger". (Generally speaking, Wallace would have done well to prod Trump more on his conspiracy theories; he didn't have to call him a liar, he could have just asked him for evidence.) When Trump changed the subject to Clinton's ethics, Wallace not only asked pointed questions about the Clinton Foundation; he also pushed Trump, who attacked the foundation, for his own, even more ridiculous outfit: the Donald J. Trump Foundation. Clinton has telegraphed this strategy since the Democratic National Convention, in which she said Trump was someone who could be easily "baited with a tweet". I will keep you in suspense, ' Trump told moderator Chris Wallace.
Trump came out swinging, pointing a finger at Democrats for causing violence at his rallies and saying: "Just like if you look at what came out today on the clips, where I was wondering, what happened with my rally in Chicago and other rallies where we had such violence?"
During the debate, Clinton called the comment "horrifying", but his comments immediately drew condemnation from some lawmakers on both sides of the aisle.
Trump's running mate, vice presidential nominee Mike Pence, said Trump "will accept the outcome" because he is going to win.
"The one thing you have over me is experience", Donald Trump told Hillary Clinton at the final debate on October 19, 2016.
So what can Mr Trump do?
Donald Trump says he'll look at the results of the USA election on Nov 8 and decide what to do "at the time". He didn't stray from the announced topics Wednesday night.
The debate answer left his own team scrambling in the aftermath of the debate.
Clinton outlined her military plan to take out the Islamic State group. Instead, he said that Putin has "outsmarted and outplayed" Clinton, and that the Russian president does not respect her. Bob Corker of Tennessee said it was "imperative that Donald Trump clearly state" he'll accept the results.
In 2000, then-Texas Governor George W. Bush gazed upon the glitzy gathering and declared: "This is an impressive crowd, the haves and the have-mores".
Conway reiterated her comments Thursday morning on ABC's Good Morning America. She said Trump had in the past also complained that his TV show was unjustly denied a USA television Emmy award. If you encounter any issue at a polling place, during early voting or on Election Day, or if you are told you can not vote, please call the national nonpartisan Election Protection Hotline at 866-OUR-VOTE or 888-VE-Y-VOTA.
Trump then pointed to the 2000 election between Al Gore and George W. Bush and the U.S. Supreme Court case Bush v. Gore, in which the justices decided, 5-4, to halt the manual recount of almost 6 million votes in Florida. In Chicago, Trump used Permasteelisa Cladding Technologies Ltd, a Connecticut-based company that imports steel from its affiliated companies in China, Newsweek said.
But the idea that people would truly rise up against the government if Trump goes down this road is still a very unlikely worst-case scenario. "There are indications of a lot of fraud around by the Clintons", Giuliani said.
In fact, there is no proof that voter fraud is a widespread problem in the United States.