Former Republican National Security Officials for Biden - Defending Democracy Together

We are former national security officials who served during the administrations of Presidents Ronald Reagan, George H.W. Bush, George W. Bush, and/or Donald Trump, or as Republican Members of Congress. We are profoundly concerned about the course of our nation under the leadership of Donald Trump. Through his actions and his rhetoric, Trump has demonstrated that he lacks the character and competence to lead this nation and has engaged in corrupt behavior that renders him unfit to serve as President. For the following reasons, we have concluded that Donald Trump has failed our country and that Vice President Joe Biden should be elected the next President of the United States.
https://www.defendingdemocracytogether.org/national-security/

Exclusive: Republican former U.S. national security officials to back Biden - Reuters

Dozens of Republican former U.S. national security officials are forming a group that will back Democratic presidential candidate Joe Biden, people familiar with the effort said, in a further sign that President Donald Trump has alienated some members of his own party. ...
https://www.reuters.com/article/us-usa-election-biden-republicans-exclus-idUSKBN23U2LY