The only legal argument is to check to see if 5000 of those voted in the primary a few weeks ago. If not, this is a matter of principles and taking a stand against a corrupt party...not a legal matter. Accepting the results according to election law is just one aspect. Accepting a candidate and assisting reelection using these tactics is another. The party needs to know they crossed a line and will not be rewarded. Even if it means losing a seat. Essentially, it’s lost anyway.
The price the gop should pay for this chicanery is DESTRUCTION! The entire party should be burned to the ground, and let the conservative phoenix rise.
The republican party should die for this behavior, and the way to kill it is to quit voting for it.