Republican candidate Donald Trump on Wednesday would not commit to accepting the outcome of the Nov. 8 U.S. presidential election if he loses, challenging a cornerstone of American democracy and sending shockwaves across the political spectrum.

Trump’s refusal, which his Democratic rival Hillary Clinton called “horrifying,” was the standout remark of the their third and final debate and ratcheted up claims he has made for weeks that the election was rigged against him.

Asked by moderator Chris Wallace whether Trump would not commit to a peaceful transition of power, the businessman-turned-politician replied: “What I’m saying is that I will tell you at the time. I’ll keep you in suspense. Ok?”

Reuters

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NEW YORK CITY - SEPTEMBER 3 2015: Republican candidate for president Donald Trump announced he had signed a pledge not to run as an independent candidate should he fail to win the party's nomination in 2016.