The debate format remains the same as it did for Democrats in July. CNN's political team will review the submissions and choose about 40 videos that can be used Wednesday. David Bohrman, CNN's Washington bureau chief and the mastermind behind the format, said he heard from two campaigns - he won't name which - expressing concerns about the selection process and the perceived liberal bias of CNN, dubbed by many conservatives as the "Clinton News Network."

"Some of the Republican candidates don't trust us. They're not completely convinced that we're going to wean out the Democratic gotcha questions," Bohrman said. "But I've been very clear from the beginning: This will be a Republican debate, and the goal is to let Republican voters see their candidates."