A wise friend of mine said that if he had been taken out before the convention then the covention would be open, hence why he quickly announced vance for vp — to secure the future of maga should they succeed.
I think Trump knows that they are going to try again, perhaps he thinks he’s living on borrowed time, that they will try again and perhaps succeed next time..so getting Vance in there, he can be his successor if God forbid that happens