Trump's obsession with finding the whistleblower or revealing his alleged identity (which some conservatives claim to know & have already leaked) has reached psychotic proportions. Most of Trump's obsessions have caused him far more trouble than their worth. Let's hope this one also does.
We may need to modify the laws, make the President more accountable. Trump should be charged with inciting to violence, IMO, even while holding office. And as Trump's vilification of the whistleblower continues, he may well say something defamatory, and the whistleblower or his lawyer may be able to sue Trump for that.
Once little Donny is out of office (the sooner the better), he should be liable for a lot of his criminal actions and his defamation of people.