In that the Fox News is carrying the debate, subscribers of DirecTV will not be able to watch it on channel 31 ( FNC) because of dispute between Nexstar.com and DirecTV over fees.
Similar to the dispute that Comcast has with DISH, depriving subscribers of DISH that are fans of the Avalanche and Nuggets.
The Fox Business Channel is purportedly going to carry the debate live.
You would be better served to watch the entire debate later on CSPAN or streaming. I do not believe that any highlight show will give Vivek Ramaswamy any screen time.