There is no constitutional procedure to 'expunge' an impeachment.
From the Feb. 22 edition of "Breitbart News Sunday":
MATTHEW BOYLE: Is it possible we that we could see like an expungement of the impeachment if Republicans take back the House majority?
REP. LEE ZELDIN (R-NY): I believe that that should be one of the very first orders of business in January of 2021, is to expunge the sham impeachment.
Published with permission of The American Independent Foundation.