> The Legislature can impeach the Administration

The problem here is that if you impeach Trump, then you get Vance, who will do the same stuff Trump is doing. You impeach Vance, and you get Johnson, who will do the same stuff Trump is doing. And so on, down the line. Eventually you run out of people in the presidential line of succession, and then you have a real problem. I suppose eventually you get to the point where you have a president who doesn't feel like getting impeached? But by then the damage to the institution has been done.

> it can hold it's officers in contempt

Who is going to enforce any orders (fines, imprisonment) around those contempt rulings? Congress and federal courts don't really have much law enforcement personnel to speak of. Trump controls federal law enforcement, and he can instruct them to ignore contempt rulings.

I guess the House (for example) has the Sergeant at Arms, but their law enforcement staff is limited, and I don't think they're going to want to get into a conflict with, say, the Secret Service, if they go to arrest a cabinet member, but Trump says no.

> and it can pass laws constraining the Administration.

There are already laws constraining the administration, and Trump and Musk are running roughshod over them. Why would they obey new laws they don't like?