If the Dems can make it happen, then the GOP should be able to prevent it.
Taking the attitude that "there's nothing we can do about it" plays right into their hands.
In terms of actual ideas:
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The GOP and other conservative organizations need to file local/state/federal lawsuits every time there's even the slightest perception of voter fraud.
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Trump should have the DHS investigate (which "supposedly" is underway).
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Have officials from both parties preside over the counting process (how is it that these people always seem to be Dems?)
These are just a few off the top of my head. I could come up with more.
I’m curious about this as well