@MugsysRapSheet Well not quite, it's not that the issue must be decided by Congress but that Congress can put in place a legal process to make the determination.
But that process itself has to be legal and legitimate.
This isn't like an impeachment, this is most likely akin to Congress passing a law that grants federal courts the authority to hear such a case, and it would remain up to the court system to settle it as per the new law.
I don't think a law that removes specific people would be valid.