NEW YORK—Fox News’ Chris Wallace worked hard to keep the final presidential debate substantive with tough questions to Hillary Clinton and Donald Trump, but it was the simplest of queries that extracted the biggest headline.
Noting Trump’s claims Wednesday night that the election was being rigged against him, Wallace asked the Republican whether he would accept the results win or lose, pointing out GOP vice presidential candidate Mike Pence had said that he would. When Trump answered that “we will look at it at the time,” Wallace seemed incredulous.

Republican presidential nominee Donald Trump shakes hands with moderator Chris Wallace, of FOX News, after the third presidential debate at UNLV in Las Vegas, on Oct. 19, 2016. Mark Ralston/Pool via AP