What is NOT debatable is that "maladministration" is an impermissible ground for impeachment.
Congress does not have the constitutional authority to change these criteria without amending the Constitution.
"Impeachment is about whatever the Congress says it is. There is no law that dictates impeachment. What the Constitution says is 'high crimes and misdemeanors,' and we define that.
Nor did George HW Bush commit an impeachable offense when he pardoned Caspar Weinberger & others to prevent them from pointing a finger at him