With an FBI investigation against his wife and allegations that she threw disabled persons into the street, I don't think that's a sound prediction.
The only people who know or care about that investigation either love him or hate him, and we all know which one of those two camps is larger.
That depends on the outcome of the investigation. If she really put disabled people out on the street and committed loan fraud, that's a big problem.
With an FBI investigation against his wife and allegations that she threw disabled persons into the street, I don't think that's a sound prediction.
There was an FBI investigation against Hillary and allegations that her husband was a rapist, and she still got the nomination.
Considering that outcome of the general election, it's unlikely that anyone under any sort of investigation would be nominated.