Meanwhile, Republican front-runner Donald Trump and his top challenger, Ben Carson, are threatening to boycott the next Republican presidential debate if host network CNBC doesn’t agree to their demands. Carson and Trump want to limit the debate time to two hours and include opening and closing statements. The previous Republican debate stretched on for a full three hours. The debate is scheduled for October 28. This comes after the first Democratic presidential debate also sparked controversy when Congresswoman Tulsi Gabbard of Hawaii said she was disinvited, one day after calling for more debates than the six currently scheduled.