Let's say they investigate and find fraud. Somehow electors choose Hillary Clinton as President. Here's what would happen:
- Republicans would never accept that.
- Donald Trump refusing to concede, set's up a shadow government in Trump Tower. (edit: as in shadow cabinet)
- Political chaos for the forseeable future.
- Total and complete obstruction in the House & Senate.
- Possible armed uprising among Trump's deplorables.
That's just the beginning. Think you'd get supreme court nominations at least? Naw, no nominations of anything for 4 years. No confirmation of cabinet. No nothing. Government shutdown just as a start.
Donald Trump could be very bad, but I think the above is actually worse.