The constitution puts the complete power to impeach and define the tiles of the process to the congress. Further it does not define the terms high crimes and misdemeanors. The terminology, along with the word impeachment itself was known through British law/tradition. It didn’t mean a literal indictable crime.
It is absolutely a political process and has nothing to do with due process rights. Due process relates to criminal proceedings, not political ones.
The reason I said that it is a dangerous precedent is exactly because this is absolutely a political hit. But so was the impeachment of Andrew Jackson.
Andrew Jackson was Trump 1.0 - killed the National Bank.
This was the argument raised in Federalist 65. That partisanship would be the victor over conscience and morality for the good of the country.