On January 2, 2021, Pierluisi was sworn in. there was a private ceremony in which he was sworn in by the Chief Justice of the Supreme Court, Maite Oronoz Rodríguez. This was followed by a controversial public ceremony on the north side of the Puerto Rican Capitol, where Pierluisi took the oath of office publicly in front of 400 guests during the COVID-19 pandemic and delivered his inagural speech.