Moderator Chris Wallace then asks Donald Trump about his recent allegations of a rigged election in the U.S.
Wallace says Trump's running mate, Mike Pence, and his daughter, Ivanka Trump, have denied the accusations and that they will respect the results.
Trump says he is not ready to say that.
Moderator Chris Wallace explains that there is a history in the U.S. of a peaceful transition of power. Donald Trump says he will keep Wallace "in suspense."
Hillary Clinton says Trump's comments are frightening, says the U.S. has been a democracy for the past 200 years and that we have a history of free and fair elections. She is appalled that Trump is talking down democracy.
The question is now: foreign hot spots.
Regarding the battle to retake Mosul, Iraq, from Islamic State militants, Chris Wallace asks if the candidates would put U.S. forces back in that theater.