There is of course voter fraud, but it's statistically so insignificant it's never been worth looking into. Spending millions, if not billions, looking into the fraction of a percent of the total votes that are fraudulent for the sake of saying we have a 100% fool proof system that gets us the same results as the crummy old 99.999835% fool proof system got us strikes me as an odd position for a supposedly fiscally conservative party to be taking. This is like me trying to get a plumbing business started and going door to door trying to convince people to let me tear their walls down to the studs looking for leaks. "Maybe it's just me, but shouldn't *every* homeowner want the peace of mind that comes with knowing there are no leaks?"
Also, Occam's Razor once again comes to mind.
Option A: one (and only one) of the two major parties in the USA has found a way to pull off widespread cheating within an extremely well organized and scrutinized election system.
Option B: a serial liar (and, in all likelihood, a clinically diagnosable narcissist) loses an election and wants everyone to know he was cheated.
For their own sake if nothing else, I hope someday at least a % of these Trumpers come to the realization that they have been fucked raw by that dude. He's a professional scammer. Go back and look at the things that were being written and said about him in NYC long before he was even a Republican, let alone POTUS. He is a snake oil salesman who pulled the same tricks on 10s of millions of vulnerable Americans as he did with Trump University, etc.
The American political system has a legitimate problem with fraud, but it's not hiding in the place Trump has managed to get the spotlight pointed.