Not exactly. There have been legitimate questions about vote tampering since the LAST election. There are now
fresh reports of foreign interference, not to mention Trump's own sabotage via his attacks on mail-in voting.
It's a double-edged sword but given Trump's polling numbers he must feel that sowing doubt about the election (ANY doubt) is more likely to benefit him (in the case of a loss). That's because if the election is deemed FUBAR he feels entitled to just stay in the white-house the same way declaring a mistrial buys you more time if you're standing accused of a serious crime.
Consider what happened in 2000 with the hanging chads. I think the system favors the incumbent, and certainly so given the current makeup of the legislature and the stacked court-system.
The GOP some time ago decided to game the system in a brazen way that founding fathers never anticipated. This is the result of a party that is all too aware that demographic trends don't bode well and so rather than try to evolve their platform to widen their tent they have to reach for these tricks. Take that too far (as we tend to see in banana republics) and this is how revolutions start.