I see Newsweek has a piece this morning titled "CNN Cutting Donald Trump Town Hall Short by 20 Minutes Raises Questions." It begins:
Questions have been raised as to why CNN appeared to cut a town hall broadcast with Donald Trump on Wednesday evening short by as much as 20 minutes....
If you go deep enough into that article, you'll see:
A CNN spokesperson told Newsweek it had gone on record "days ago" that the town hall would last "roughly an hour" with "a little room to bleed over."
I believe that, because, seen live, the ending didn't look abrupt, Trump didn't act surprised or outraged, and the moderator, Kaitlan Collins, didn't seem to be acting ungracious or punitive. She had been prodding him about his lies/"lies" throughout, and to give up before the planned end time would seem as though her pushback had been inadequate, which is not something CNN would want to concede. Of course, Trump bulled ever onward. That was predicted and prepared for. Nothing went wrong, and it would have been wrong to pull the plug early.