You keep using the word “impeached.” I don’t think you understand what it means.
The penalty is removal from office. If the person is not in the office, you can’t impeach him.
Impeachment is not going to happen.
Look at the quote I gave from Article I, Section 3, 7:
“Judgment in Cases of Impeachment shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States: but the Party convicted shall nevertheless be liable and subject to indictment, Trial, Judgment and Punishment, according to Law.”
The Constitution allows any impeachment judgment up to and including removal from office and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States.
IMHO, that seems to say that somebody who still has the honorary title of President Bush, President Clinton, President Obama, etc can be disqualified from holding that office of honor under the United States through impeachment. Other than that paragraph I don’t see anything that defines what impeachment is or who can be subject to it.
What am I missing?