(CHICAGO) Donald Trump on Wednesday refused to say he would accept the result of next month’s presidential election.

“I will look at it at the time,” Trump said when challenged during the final presidential debate on his claims that the election is “rigged” against him.

He added: “I will keep you in suspense.”

The comments at the Las Vegas showdown marked an extraordinary departure from one of the most fundamental principles of American democracy: the peaceful transfer of power after an election. The remarks were also a dramatic departure from the first hour of the debate, where Trump showed unusual restraint as he and Clinton engaged in substantial policy discussions over issues such as the Supreme Court, the Second Amendment and gun rights.

Hillary Clinton, the Democratic nominee who is leading Trump in most polls, said the Republican nominee’s remarks were “horrifying.”

“You are not up to doing the job,” Clinton charged, claiming that every time events do not turn out in his favor, Trump claimed things were “rigged” against him. She highlighted Trump’s past comments lamenting results of the Iowa caucuses, legal judgments against him — even Trump’s complaints when he did not win an Emmy.