Declined to endorse
- Former Executive branch officials
- George W. Bush, 43rd President of the United States (2001–2009), Governor of Texas (1995–2000)[68]
- Mike Pence, 48th Vice President of the United States (2017–2021), Governor of Indiana (2013–2017), U.S. Representative from Indiana (2001–2013); withdrawn candidate for President in 2024[69]
- U.S. Senators
- Rand Paul, Kentucky (2011–present); candidate for President in 2016[70]
- Mitt Romney, Utah (2019–present); Republican nominee for President in 2012[71][better source needed]
- Todd Young, Indiana (2017–present)[72]
- U.S. Representatives
- John Boehner, OH-08 (1991–2015); Speaker of the House (2011–2015)[73]
- Ken Buck, CO-04 (2015–2024)[74]
- Tim Burchett, TN-02 (2019–present)[74]
- Randy Feenstra, IA-04 (2021–present)[75]
- Mike Gallagher, WI-8 (2017–present)[76]
- French Hill, AR-02 (2015–present)[77]
- David Joyce, OH-14 (2013–present)[78]
- Paul Ryan WI-1 (1999-2019), Speaker of the House (2015–2019), 2012 Republican nominee for Vice President[79]
- David Schweikert, AZ-01 (2023–present), AZ-06 (2013–2021), AZ-05 (2011–2013)[77]
- Governors
- Jeb Bush, Florida (1999–2007); candidate for President in 2016[80]
- Chris Christie, New Jersey (2010–2018); candidate for president in 2016; withdrawn candidate for President in 2024[81]
- Eric Holcomb, Indiana (2017–present); previously endorsed Mike Pence[82][better source needed]
- John Kasich, Ohio (2011–2019); U.S. Representative from OH-12 (1983–2001); Candidate for President in 2000 and 2016[83]
- Organizations
- Individuals
- Erick Erickson, conservative talk radio host, blogger, and former Macon City Councilman from Ward 5 (2007–2011)[86]
- Labor unions
- State Legislators
- Jessica de la Cruz, Minority Leader of the Rhode Island Senate (2022–present)[63]
