The combat veteran's 46-page suit says Trump administration attempts to punish him violate the First Amendment, separation of powers, due process, and more.
Josh Gruenbaum, a financier with no apparent expertise in foreign policy, is a top official at the General Services Administration, which has no role in foreign policy.
The defense secretary, who originally threatened to court-martial the senator, said on Monday said that he would instead try to reduce his rank and retirement pay.