Debate moderator John Dickerson and his staff were in rehearsals when the news started to come out of Paris. CBS has partnered with Twitter for the debate and many of the questions submitted by Twitter users in hours since the attacks have also centered on Paris.

CBS News tells ABC that there were never discussions to postpone the debate.

\"We thought it made the debate even more important. It gave it an immediacy and an opportunity to discuss this challenge and this threat,\" Isham said.

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