I say he is self destructing. And my read of the Constitution is that so long as both houses have 2/3rds, they could impeach the President and Vice President together, and that they don't need to follow any standing order of succession. They can install whom ever they want.
But, will they have cause to impeach Pence. As VP, maybe he has not had the chance to do anything wrong?
Remember in Oliver Stone's movie, John Dean telling Nixon that Deep Throat wants $2 Meg cash, throwing up his hands and lamenting that it would only be organized crime which would be able to do that.
Nixon: "2 million, I got that."
We now know that that was from an unlawful cash contribution from the Shah of Iran.
And then when Dean approached Deep Throat, indignantly, "Why are you black mailing the President?"
"That isn't the question. The question is, why is he paying?"
What is being alleged about Trump is already far more serious than anything of Watergate.
SJG