Sen. Marco Rubio (R-Fla.) is demanding the Army kick out the West Point graduate whose pro-communist social media posts are under investigation.

In a letter to acting Army Secretary Ryan McCarthy, Rubio questioned how someone with the officer’s social media history received a commission and said the Army should immediately nullify the commission and pursue all available disciplinary options under the Uniform Code of Military Justice.

“While I strongly believe academic institutions must respect the exchange of ideas and allow students to voice their opinions, members of the military who harbor anti-American views and express their desire to harm our country and its leaders are unfit to serve and defend our nation—and certainly should not enjoy the privilege of attending or graduating from an institution such as West Point, a taxpayer-funded military academy,” Rubio wrote.

At issue are photos 2nd Lt. Spenser Rapone posted online last week from his May 2016 West Point graduation. In them, he is wearing a T-shirt with Argentine revolutionary Che Guevara’s face under his uniform and has “communism will win” written on the bottom of his cap.