Do you recall the use (yours) of the word "affidavit". You note that lawyers aren's supposed to do that--news break--no one is supposed to do that, there is a word for it. It is usually called perjury.

Now as to grounds for impeachment--the reason listed in the Constitution is "high crimes and misdeanors". The question, as answered by the Senate, was answered as "perjury is not a high crime or misdemeanor".

That is history, subject closed--another chapter of history with an ugly ending.
President Reagan summed it up nicely, "Some people go through their entire lives wondering if they made a difference, Marines don't have that problem!!!"