We-ell. I've been wondering for a while if the passing of the tax bill will mark the end of Trump's presidency.
The GOP won't need him any more, so will be more willing to get rid.
And if he wants to duck out of the job (too much hard work, maybe he thinks the prosecution risk will go away), he will want to go out on a bigly triumph. Like, any triumph at all.
A competent (though vile) Pence presidency would make for a more stable US, and there may be a lot less kompromat on Pence. So Pence may be less desirable for the Russians.
I could well be wrong about the tax bill causing the end of Trump. But if I'm right, it would make perfect sense that Rohrabacher-the-Russophile has suddenly discovered he doesn't want it to pass yet.