Republican presidential candidate Donald Trump has said he will accept the result of the US election "if I win".
But he added he reserved the right to file a legal challenge.
His comments came after he refused to promise during the final presidential debate in Las Vegas that he would trust the outcome on November 8th if he loses.
The Republican nominee had told the audience he would keep them "in suspense".
Donald Trump's refusal to say whether he will accept the result of the US Presidential Election or not is "horrifying", Hillary Clinton has said.
Speaking after the third and final presidential debate the Democratic Party candidate continued that accepting the results of "free and fair elections" is part of the US's 240-year history.
Mr Trump's refusal to say whether he will accept the outcome "is part of his whole effort to blame somebody else for his campaign... Whenever he is losing... he says it's [the system] rigged against him".
Ms Clinton also said she "didn't pay any attention" to the billionaire businessman branding her a "nasty woman".
Ms Clinton also said she was "concerned" that the Republican candidate has "refused" to "condemn" Russian "cyber-attacks against Americans".
Donald Trump has refused to say if he would accept the result of the election if he loses, but could he challenge it and what would happen?
During the debate Trump said "bad hombres" needed removing from the US and branded Clinton a "nasty woman". Both sparked jokes on Twitter.
The Republican refused to say whether he will accept the result of the presidential election, saying: "I will look at it at the time."