My guess would be the democrats will claim the impeachment is legal because it BEGAN while Trump was president.
Only SCOTUS could overrule them and its loaded with Bush rats.
Doubt SCOTUS would allow it. Too significant.
Comey now calling for Biden to pardon Trump. I predicted that Biden will issue a statement advocating that the impeachment not go forward in the Senate. He will be lionized by the MSM for unifying the country and looking to the future.