A Marine facing dismissal for making statements critical of President Obama superimposed the president’s face on a "Jackass" movie poster and sold “Nobama” stickers, according to Marine prosecutors.

An administrative separation hearing began Thursday for Sgt. Gary Stein, who could receive an “other than honorable” discharge for saying he would not follow orders and calling Obama a “domestic enemy” on his “Armed Forces Tea Party” Facebook page.

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The Associated Press reported from the hearing at Camp Pendleton in San Diego, Calif., on Thursday that Marine prosecutor Capt. John Torresala said Stein acted irresponsibly and disregarded repeated warnings that his anti-Obama postings violated Pentagon policy.

Stein has argued that he was acting as a private citizen, and said he was talking theoretically about not following unlawful orders.

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“My heart is heavy this morning as I tie up my boots and start my hour drive to Camp Pendleton,” Stein wrote on his Facebook page early Thursday morning. “It hurts me to know that I could be punished for the one of the constitutional rights I have given the last 9 years of my life to protect.

“While I could have better chosen my words when making the comments in question, I feel that they do not warrant the punishment that could be handed down today,” he wrote.

Stein’s case has garnered the support of Rep. Duncan Hunter (R-Calif.), a Marine reservist who has served in Iraq and Afghanistan. Hunter wrote to the Marines this week urging them to drop their discharge proceedings against Stein.

Stein sued in federal court Tuesday in an attempt to stop the military hearing Thursday, but the judge declined to delay the proceeding.

His lawsuit argued that the military’s policy that prohibits political activities for service members in uniform is overly broad and violated his First Amendment rights.

The court’s ruling said that the Marine’s decision on his discharge was not predetermined.

— This post was corrected after the Associated Press specified that Obama's face was superimposed on a "Jackass" poster.