This is a different republican party compared to the one in the 70s. How is this not so very obvious? Back then they had not lost all their integrity to the cynical partisanship we observe now.
They will not destroy their own party and chances of reelection .
Don’t buy into that common narrative of them having some great integrity back then either. The tide only turned when the proof came out and it became obvious Nixon was a crook and the public weren’t going to stand for it. All that’s changed since then is now the public don’t care either as long as it’s one of their own party.