Sourced from a cuckoo wingnut site that thinks they wouldn't be in close races if they had supported Trump!

Kelly Ayotte, Senator of New Hampshire
Robert Bentley, Governor of Alabama
Jaime Herrera Beutler, Representative of Washington
Bradley Byrne, Representative of Alabama
Jason Chaffetz, Representative of Utah
Mike Coffman, Representative of Colorado
Barbara Comstock, Representative of Virginia
Michael D. Crapo, Senator of Idaho
Dennis Daugaard, Governor of South Dakota
Rodney Davis, Representative of Illinois
Deb Fischer, Senator of Nebraska
Jeff Flake, Senator of Arizona
Jeff Fortenberry, Representative of Nebraska
Darryl Glenn, Running for Senate from Colorado
Cory Gardner, Senator of Colorado
Scott Garrett, Representative of New Jersey
Kay Granger, Representative of Texas
Cresent Hardy, Representative of Nevada
Bill Haslam, Governor of Tennessee
Joe Heck, Representative of Nevada, running for Senate
Gary R. Herbert, Governor of Utah
Jon M. Huntsman Jr., Former governor of Utah
Will Hurd, Representative of Texas
David Jolly, Representative of Florida

John Kasich, Governor of Ohio
John Katko, Representative of New York
Steve Knight, Representative of California
Mike Lee, Senator of Utah
Frank A. LoBiondo, Representative of New Jersey
Mia Love, Representative of Utah
Susana Martinez, Governor of New Mexico
John McCain, Senator of Arizona
Patrick Meehan, Representative of Pennsylvania
Lisa Murkowski, Senator of Alaska
George E. Pataki, Former governor of New York
Erik Paulsen, Representative of Minnesota
Tim Pawlenty, Former governor of Minnesota
Rob Portman, Senator of Ohio
Martha Roby, Represenative of Alabama
Tom Rooney, Representative of Florida
Brian Sandoval, Governor of Nevada
Mike Simpson, Representative of Idaho
Chris Stewart, Representative of Utah
Dan Sullivan, Senator of Alaska
John Thune, Senator of South Dakota and chairman of the Republican Conference
Fred Upton, Representative of Michigan
Ann Wagner, Representative of Missouri