Democratic Senator Mark Kelly of Arizona is a retired Navy captain and former astronaut who has served in the U.S. Senate since 2020.

He is a member of the Senate Armed Forces Committee, the Senate Select Committee on Intelligence and other committees. He receives a military pension for his distinguished military service.

On Jan. 12, 2026, Kelly filed a complaint in the U.S. District Court for the District of Columbia for declaratory and injunctive relief against Secretary of Defense Pete Hegseth, the U.S. Department of Defense, Secretary of the Navy John Phelan, and the U.S. Department of the Navy. 

Hegseth’s letter of censure

The complaint centered on a Secretarial Letter of Censure that Secretary Hegseth had filed against Kelly calling for consideration of a reduction of his rank and pay and for possible “criminal prosecution or further administrative action” if he continued making statements to which the Secretary had objected.

These statements had included criticism of: President Donald Trump’s deployment of National Guard troops in American cities; Trump’s strikes on boats allegedly carrying drugs in the Caribbean Sea and Pacific Ocean, including a “double tap” strike directed against two survivors of an initial strike; military leadership for “firing admirals and generals” and surrounding themselves with “yes men”; and the issuance of a video with five other members of Congress entitled “Don’t Give Up the Ship,” counseling members of the military that they had an obligation to disobey unlawful military orders.

Administration reaction to Kelly’s statements

These actions and statements had been highly criticized by administration officials, some of whom had previously also indicated that members of the military were not obligated to obey illegal orders that might constitute war crimes.

Presidential advisor Stephen Miller had characterized the video as a call for “insurrection” and as a “general call for rebellion.” Trump had referred to it as “SEDITIOUS BEHAVIOR AT THE HIGHEST LEVEL,” called for jailing the members of Congress and suggested that their offenses were “punishable by DEATH.”

Secretary Hegseth had referred to the six members of Congress as the “Seditious Six.” These and other comments had required Kelly, whose wife Gabby Giffords had, as a member of Congress, been wounded in an attempted assassination attempt, to seek special protection.

 In issuing his letter of reprimand, Secretary Hegseth had claimed that Kelly had undermined the chain of command; counseled disobedience; created confusion about duty; brought discredit upon the armed forces; and engaged in conduct unbecoming an officer.

Kelly’s Response Alleging Constitutional Violations

Kelly’s legal complaint noted that Hegseth’s censure and threats of further punishment “have inflicted reputational harm related to the Senator’s service record, placed his grade and pay in jeopardy, and prejudged the outcome of the grade-determination proceeding.”

Kelly’s suit claimed that the Secretary’s actions violated the free speech provision of the First Amendment by punishing him for protected political speech. The complaint observed that such actions were “subject to strict scrutiny because they seek to punish Senator Kelly based on the content and viewpoint of his speech.”

Kelly’s complaint also relied on the Speech and Debate Clause in Article I, Section 6, of the U.S. Constitution, which is designed to protect the speech of members of Congress and is designed, according to Eastland v. U.S. Servicemen’s Fund (1975), to cover all “legislative activity” and not just “literal speech or debate.” Kelly noted that Congress was responsible for regulating the armed forces, that it had “authority over military and civilian defense appointments,” and that it had specifically legislated against war crimes.

Kelly’s complaint further argued that the actions taken and threatened against Kelly violated the separation of powers by threatening congressional independence and granting “the Executive a power over legislators that the Constitution does not contemplate.” It noted that Kelly was no longer a military officer and that “To Plaintiff’s knowledge, a sitting Member of Congress has never been subject to military punishment based solely on his speech.”

In addition, the complaint said that the government had not provided Kelly with due process and that it had violated the Administrative Procedure Act (APA) and exceeded statutory authority.

What to Watch For

Kelly’s arguments, especially those related to First Amendment free speech rights and the Speech and Debate Clause, appear strong, and the district court could issue an injunction against further proceedings against him. Any decision would likely be appealed to the District Court of Appeals and could ultimately be appealed to the US Supreme Court.

Kelly has said that he has “every right to say these things as an American, as a retired service member and as a U.S. senator” (Mineiro 2026) and that “If Pete Hegseth succeeds in silencing me, then he and every other secretary of defense who comes after him will have license to punish any retired veteran, of any political persuasion, for the things that they say” (Gregorian, Reilly, Kosnar and Thorp, 2026). Although he does not appear to have altered his own speech, his complaint expresses the fear that the administration’s actions are likely to chill the speech of members of a coordinate branch of government, which is designed to protect individual freedoms by checking excessive executive power.

John R. Vile is a political science professor and dean of the Honors College at Middle Tennessee State University.