In a statement accompanying her vote against impeachment on January 13, 2021, Mace said:

"What we're doing today, rushing this impeachment in an hour- or two-hour-long debate on the floor of this chamber, bypassing judiciary, poses great questions about the constitutionality of this process."

Mace had that same day publicly condemned Trump and said he must be held accountable for the Capitol attack, leading critics to characterize her procedural objections as cover for a vote she could not otherwise defend.

Source: Rep. Nancy Mace / House.gov · archived