That doesn't really compute. Why would that suddenly cause people who have followed Trump thus far to go "Wow, this guy is a sleaze ?"
Tcha! That's thinking from the fact-based world, where people respond to facts.
The bulk of Trump's following are in the feelz-based world. The facts can stay the same, but if the feelz change they change – and those feelz can be steered or outright created by the messaging with which they are sprayed.
Also, in general, people following because of faith in a cause or great leader as @AcrossthePond55 describes have a lot of elasticity. They will stretch and stretch and stretch to accommodate the cognitive dissonance. And then suddenly they will snap – perhaps over a very small last straw – and spring back to their previous boundaries.
At that point they will either "always have had" these boundaries,
or they will now focus their victimhood on the great leader and feel anger at him for "betraying them".
(A few will take genuine responsibility for their own actions, but one shouldn't assume the majority will.)