Care to discuss legal grounds for impeaching?
Sure, but you're not equipped to handle what you'll learn about it....First off, are there illegal grounds for impeachment?

Nah, you'll keep repeating defeated phrases or run away claiming your dog is on fire. Simple really...."high crimes and misdemeanors"....archaic language from the late 1700's meaning the president has either broken or failed to enforce laws in force. There can be a multitude of levels.....each one easily exceeded by this president's treachery. The House impeaches....the Senate convicts.....step one is a forgone conclusion if he tries to back-door in the illegals.
Your turn.
That's a lot of typing just to say nothing, and only exhibit your ignorance.
Determining the Constitutionality of an executive order is the sole purview of the courts, not Congress; executive orders are Constitutional until the Supreme Court rules otherwise. When an executive order is overturned as un-Constitutional, the president is neither impeached nor tried in the Senate (see, e.g.,
Youngstown Sheet & Tube Co. v. Sawyer (1952)).