Well, this is embarrassing. I call your RFK and Tulsi and raise you 171 prominent Republicans who are not supporting Trump:
George W. Bush, President of the United States (2001–2009)
Dick Cheney, Vice President of the United States (2001–2009)
Mike Pence, Vice President of the United States (2017–2021) under Trump
John Bolton, U.S. National Security Advisor (2018–2019)
Dan Coats, Director of National Intelligence (2017–2019)
William Cohen, United States Secretary of Defense (1997–2001)
John Danforth, United States Ambassador to the United Nations (2004–2005)
Mark Esper, United States Secretary of Defense (2019–2020)
Alberto Gonzales, United States Attorney General (2005-2007)
Chuck Hagel, United States Secretary of Defense (2013–2015)
John F. Kelly, White House Chief of Staff (2017–2019)
Ray LaHood, United States Secretary of Transportation (2009–2013)
Robert D. Blackwill, United States Ambassador to India (2001–2003) (endorsed Kamala Harris)
Ty Cobb, White House Special Counsel (2017–2018)
Ashley Davis, White House Deputy Director of Management and Administration (2001–2003) (endorsed Nikki Haley)
Ronald Gidwitz, Acting U.S. Ambassador to the European Union (2020–2021)
Alyssa Farah Griffin, White House Director of Strategic Communications (2020)
Stephanie Grisham, White House Communications Director and White House Press Secretary (2019–2020) (endorsed Kamala Harris)
Michael E. Guest, United States Ambassador to Romania (2001–2004) (endorsed Kamala Harris)
Cassidy Hutchinson, executive assistant to the White House Chief of Staff (2020–2021)
Bobbie Kilberg, Director of the Office of Public Liaison (1989–1992) (endorsed Chris Christie)
Mary Kramer, U.S. Ambassador to Barbados (2004–2006) (endorsed Nikki Haley)
Frank Lavin, U.S. Ambassador to Singapore (2001–2005)
John Lehman, United States Secretary of the Navy (1981–1987)
Rosario Marin, U.S. Treasurer (2001–2003)
Sarah Matthews, Deputy White House Press Secretary (2020–2021) (switched endorsement to Biden after Haley withdrew)
John McKay, U.S. Attorney for the Western District of Washington (2001–2007) (endorsed Kamala Harris)
H. R. McMaster, U.S. National Security Advisor (2017–2018)
Harriet Miers, White House Counsel (2005–2007)
Omarosa Manigault Newman, Communications Director of the Office of Public Liaison (2017–2018)
Elizabeth Neumann, DHS Assistant Secretary for Counterterrorism and Threat Prevention (2018–2020)
Karen Pence, Second Lady of the United States (2017–2021)
Jeanne Phillips, United States Ambassador to the OECD (2001–2002)
Anthony Scaramucci, White House Communications Director (2017) (endorsed Kamala Harris)
Marc Short, Chief of Staff to the Vice President (2019–2021) (endorsed Mike Pence)
Richard V. Spencer, United States Secretary of the Navy (2017–2019)
Miles Taylor, Chief of Staff of the United States Department of Homeland Security (2019)
Jay Town, United States Attorney for the Northern District of Alabama (2017–2020)
Olivia Troye, Homeland Security and Counterterrorism advisor and lead COVID-19 advisor to the Vice President (2018–2020) (endorsed Kamala Harris)
Bill Cassidy, U.S. Senator from Louisiana (2015–present)
Susan Collins, U.S. Senator from Maine (1997–present) (endorsed Nikki Haley)
Jerry Moran, U.S. Senator from Kansas (2011–present)
Lisa Murkowski, U.S. Senator from Alaska (2002–present) (endorsed Nikki Haley)
Mitt Romney, U.S. Senator from Utah (2019–present)
Todd Young, U.S. Senator from Indiana (2017–present)
Rudy Boschwitz, U.S. Senator from Minnesota (1978–1991)
Jeffrey Chiesa, U.S. Senator from New Jersey (2013)
Bob Corker, U.S. Senator from Tennessee (2007–2019)
Jeff Flake, Ambassador to Turkey (2022–present)
Cory Gardner, U.S. Senator from Colorado (2015–2021)
Judd Gregg, U.S. Senator from New Hampshire (1993–2011)
Gordon J. Humphrey, U.S. Senator from New Hampshire (1979–1990) (endorsed Nikki Haley)
George LeMieux, U.S. Senator from Florida (2009–2011) (endorsed Ron DeSantis)
Rob Portman, U.S. Senator from Ohio (2011–2023)
Alan Simpson, U.S. Senator from Wyoming (1979–1997)
John E. Sununu, U.S. Senator from New Hampshire (2003–2009)
Pat Toomey, U.S. Senator from Pennsylvania (2011–2023)
David Joyce, U.S. Representative from OH-14 (2013–present)
Thomas Massie, U.S. Representative from KY-04 (2012–present) (endorsed Ron DeSantis)
Greg Pence, U.S. Representative from IN-06 (2019–present) (endorsed Mike Pence
David Valadao, U.S. Representative from CA-22 (2023–present)
Gresham Barrett, U.S. Representative from SC-03 (2003–2011) (endorsed Nikki Haley)
John Boehner, Speaker of the United States House of Representatives (2011–2015)
Mo Brooks, U.S. Representative from AL-05 (2011–2023)
Susan Brooks, U.S. Representative from IN-05 (2013–2021) (endorsed Chris Christie)
Rod Chandler, WA-08 (1983–1993)
Liz Cheney, U.S. Representative from WY-AL (2017–2023)
Tom Coleman, MN-06 (1976–1993)
Barbara Comstock, U.S. Representative from VA-10 (2015–2019) (endorsed Kamala Harris)
Tom DeLay, U.S. Representative from TX-22 (1985–2006) (endorsed Randall Terry)
Mike Gallagher, U.S. Representative from WI-08 (2017–2024)
Anthony Gonzalez, U.S. Representative from OH-16 (2019–2023)
Wayne Gilchrest, MD-01 (1991–2009) (endorsed Kamala Harris)
Jim Greenwood, PA-08 (1993–2005)
Will Hurd, U.S. Representative from TX-23 (2015–2021) (former candidate for president
John Katko, U.S. Representative from NY-24 (2015–2023)
Adam Kinzinger, U.S. Representative from IL-16 (2013–2023)
John LeBoutillier, NY-06 (1981–1983) (endorsed Kamala Harris)
Mia Love, U.S. Representative from UT-04 (2015–2019)
Susan Molinari, NY-13 (1993-1997)
Jack Quinn, NY-30 (1993–2005) (endorsed Kamala Harris)
Tom Rice, U.S. Representative from SC-07 (2013–2023)
Denver Riggleman, VA-05 (2019–2021) (independent since 2022
Paul Ryan, Speaker of the United States House of Representatives (2015–2019)
Joe Scarborough, U.S. Representative from FL-01 (1995–2001)
Claudine Schneider, RI-02 (1981–1991) (endorsed Kamala Harris)
Chris Shays, CT-4 (1987–2009) (endorsed Kamala Harris)
Peter Smith, VT-AL (1989–1991)
Alan Steelman, TX-05 (1973–1977) (endorsed Kamala Harris)
David Trott, MI-11 (2015–2019) (endorsed Kamala Harris)
Fred Upton, U.S. Representative from MI-06 (1993–2023)
Joe Walsh, U.S. Representative from Il-08 (2011–2013)
David Emery, U.S. Representative from Maine (1975-1983) (endorsed Kamala Harris)
Eric Holcomb, Governor of Indiana (2017–present)
Phil Scott, Governor of Vermont (2017–present)
Charlie Baker, Governor of Massachusetts (2015–2023) and President of NCAA (2023–present)
Jeb Bush, Governor of Florida (1999–2007)
Chris Christie, Governor of New Jersey (2010–2018)
Jim Edgar, Illinois (1991–1999) (endorsed Kamala Harris)
Bill Haslam, Governor of Tennessee (2011–2019)
Larry Hogan, Governor of Maryland (2015–2023)
Asa Hutchinson, Governor of Arkansas (2015–2023)
John Kasich, Governor of Ohio (2011–2019)
Pat McCrory, Governor of North Carolina (2013–2017)
James G. Martin, Governor of North Carolina (1985–1993)
George Pataki, Governor of New York (1995–2006)
Marc Racicot, Governor of Montana (1993–2001)
Bruce Rauner, Governor of Illinois (2015–2019)
Mark Sanford, Governor of South Carolina (2003–2011)
Arnold Schwarzenegger, Governor of California (2003–2011)
Bill Weld, Governor of Massachusetts (1991–1997)
Christine Todd Whitman, Governor of New Jersey (1994–2001)
John Dougall, Auditor of Utah (2013–present)
Jeanette Nuñez, Lieutenant Governor of Florida (2019–present) (endorsed Ron DeSantis)
Roby Smith, Treasurer of Iowa (2023–present) (endorsed Vivek Ramaswamy)
Geoff Duncan, Lieutenant Governor of Georgia (2019–2023)
Adam Laxalt, Attorney General of Nevada (2015–2019)
Bob Orr, former associate justice of the North Carolina Supreme Court (1995–2004) (endorsed Kamala Harris)
Corey Stapleton, 2024 candidate for president
Michael Steele, Lieutenant Governor of Maryland (2003–2007)
Cate Zeuske, Secretary of the Wisconsin Department of Revenue (1996–2001)
Becky Edwards, Utah state representative from the 20th district (2009–2018)
Peter Mills, Maine state senator from the 26th district (1996–2010) (endorsed Kamala Harris)
Doug Coleman, member of the Arizona House of Representatives from the 16th district (2013–2019) and former mayor of Apache Junction
Paula Dockery, member of the Florida State Senate from the 17th district (2002–2012)
Susan Gerard, member of the Arizona Senate from the 18th district (2001–2003)
Carlos Guillermo Smith, Senator-elect from the 17th district
Deb Gullett, member of the Arizona House of Representatives from the 11th district (2003–2005) and from the 18th district (2001–2003) (endorsed Kamala Harris)
Pete Hershberger, member of the Arizona House of Representatives from the 26th district (2001–2008) (endorsed Kamala Harris)
Joel John, member of the Arizona House of Representatives from the 4th district (2021–2023) (endorsed Kamala Harris)
Roger Katz, member of the Maine Senate from the 15th district (2014–2018) and from the 24th district (2010–2014)(endorsed Kamala Harris)
Steve May, member of the Arizona House of Representatives from the 26th district (1999–2003) (endorsed Kamala Harris)
John S. McCollister, member of the Nebraska Legislature from the 20th district (2015–2023) (endorsed Kamala Harris)
Peter Mills, member of the Maine Senate from the 26th district (1996–2010) (endorsed Kamala Harris)
Roberta Voss, member of the Arizona House of Representatives from the 19th district (1997–2003)(endorsed Kamala Harris)
Bob Worsley, member of the Arizona Senate from the 25th district (2013–2019)(endorsed Kamala Harris)
Manny Díaz Jr., Education Commissioner of Florida (2022–present)
John Giles, mayor of Mesa
Stephanie Kopelousos, Secretary of Transportation of Florida (2007–2011)
Joseph Ladapo, Surgeon General of Florida (2021–present) (endorsed Ron DeSantis)
Daniel Rickenmann, Mayor of Columbia
Mary Pat Christie, First Lady of New Jersey (2010–2018) (endorsed Chris Christie)
Steve Laffey, 2024 candidate for president
James Comey, Director of the Federal Bureau of Investigation (2013-2017)
J. Michael Luttig, Judge of the United States Court of Appeals for the Fourth Circuit (1991–2006)
Michael Brodkorb, Deputy Chair of the Republican Party of Minnesota (2009–2011) (endorsed Kamala Harris)
Jennifer Horn, New Hampshire Republican Party Chair (2013–2017)
Jennifer Nassour, Massachusetts Republican Party Chair (2009–2011) (endorsed Nikki Haley)
Chip Saltsman, Tennessee Republican Party Chair (1999–2001) (endorsed Mike Pence)
Michael Steele, Lieutenant Governor of Maryland (2003–2007)
Amy Tarkanian, Nevada Republican Party Chair (2011–2012) (endorsed Nikki Haley)
Chris Vance, Chair of the Washington State Republican Party (2001–2006)
Kathy Barnette, candidate for Senator from Pennsylvania in 2022
John Anthony Castro, perennial candidate (candidate for president)
George Conway, lawyer and activist
S. E. Cupp, political commentator
Jenna Ellis, lawyer and alleged racketeering co-conspirator
Carly Fiorina, CEO of Hewlett-Packard (1999–2005) and candidate for president in 2016
David Frum, political commentator and speech writer
Nick Fuentes, white nationalist political commentator and streamer (originally endorsed Donald Trump before withdrawing endorsement)
Robert Kagan, former Republican
Sarah Longwell, political strategist
Meghan McCain, political commentator
Ana Navarro, political commentator (endorsed Kamala Harris)
Ramesh Ponnuru, political commentator
Harry E. Sloan, former chairman of Metro-Goldwyn-Mayer and SBS Broadcasting (Endorsed Joe Biden)
Eric Tanenblatt, former Chief of Staff to Sonny Perdue
Fred Trump III, , advocate for people with disabilities (endorsed Kamala Harris)
George Will, conservative columnist and political commentator who left the party in 2016 because of Trump