Republican US presidential nominee Donald Trump and Democratic US presidential nominee Hillary Clinton arrive before their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, US, October 19, 2016. [Photo/Agencies]

LAS VEGAS - Republican candidate Donald Trump refused to say on Wednesday that he would accept the outcome of the Nov. 8 US presidential election, leaving open the possibility he would challenge the ultimate outcome.

In the third and final presidential debate with Democratic rival Hillary Clinton, Trump said he would wait to decide whether the outcome was legitimate.

"I will tell you at the time, I will keep you in suspense," Trump said.

Clinton responded: "Let's be clear about what he is saying and what that means: He is denigrating, he is talking down our democracy and I for one am appalled that someone who is the nominee for one of our two major parties would take that position."

In a fiery debate that centered more on policy than the earlier showdowns, Trump accused Clinton's campaign of orchestrating a series of accusations by women who said the businessman made unwanted sexual advances against them.

Trump said all of the stories were "totally false" and suggested Clinton was behind the charges. He called her campaign "sleazy."

"I think they either want fame or her campaign did it, and I think it's her campaign," Trump said.