Mayorkas is being subject to this because Republicans in Congress don't like the way he's doing his job and the way he defended the Administration's policies, not because there's any evidence that he's done anything illegal.

Of course. The entire process is politically motivated. That's the game and these are the rules it shall be played under.

But that's never resulted in an impeachment proceeding against the official heading that Department, for the obvious reason that: i) that's not a ground for impeachment; and ii) if the official isn't personally committing crimes, the President can (and likely will) just replace him with someone who shares the same approach to running the Department.

This is true under the *old* rules, where the Impeachment process was considered a serious matter, as in something you don't do unless absolutely necessary. Kind of like pulling a fire alarm.

But as we've seen: even pulling fire alarms with the direct intent of disrupting Congress and delaying its work isn't a big deal anymore. The Trump Star Chamber and the Ukrainian phone call BS taught us that the democrats view the impeachment process as just another way to do oppo research and occupy news cycles. So that's how this will be used with respect to Mayorkas.

They were warned things would end up this way, but they did it anyway.