Mike Pence Formally Enters 2024 Race, Challenging Trump
New York Times
Mr. Pence, who filed paperwork declaring his candidacy, was once a stalwart supporter and defender of Donald J. Trump, but split with his former boss after the Jan. 6 attack on the Capitol.
https://www.nytimes.com/2023/06/05/us/politics/pence-2024-president-candidate.html