Isn't that what Nixon did?
If the goal of impeachment is removal from office and the Cabinet member voluntarily removes himself from office, isn't the goal achieved?
If they are afraid that the person will be appointed to office again, the Senate can always refuse to confirm that person. They don't need an ex post facto impeachment.
-PJ
Isn’t there a current Democrat Representative from Florida that was impeached as a Federal Judge, removed from office, so he ran and won a seat in congress?