Former Republican Sen. Jeff Flake (R-AZ), who encouraged the GOP to "put country over party" during the partisan impeachment trial and announced his decision to refrain from casting his ballot for President Donald Trump in April, is part of the group of Republicans formally backing Joe Biden (D).

The list includes "former Republican Sens. Gordon Humphrey of New Hampshire (who is now an independent) and John Warner of Virginia," as well as several former House members, according to Fox News.

Others include:

Former Reps. Steve Bartlett of Texas, Bill Clinger of Pennsylvania, Tom Coleman of Missouri, Charlie Dent of Pennsylvania, Charles Djou of Hawaii, Mickey Edwards of Oklahoma, Wayne Gilchrest of Maryland, Jim Greenwood of Pennsylvania, Bob Inglis of South Carolina, Jim Kolbe of Arizona, Steve Kuykendall of California, Ray LaHood of Illinois (who served as Transportation secretary in the Obama administration), Jim Leach of Iowa, Connie Morella of Maryland, Mike Parker of Mississippi, Jack Quinn of New York, Claudine Schneider of Rhode Island, Chris Shays of Connecticut, Peter Smith of Vermont, Alan Steelman of Texas, Bill Whitehurst of Virginia, Dick Zimmer of New Jersey, and Jim Walsh of New York.