A Marine sergeant who started a Facebook group that is openly critical of President Barack Obama and posted comments saying he will not follow the unlawful orders of the commander in chief is facing possible dismissal from the Corps.

The Marines on Wednesday told Sgt. Gary Stein — a Camp Pendleton Marine who started the Facebook page called Armed Forces Tea Party — that he is in violation of Pentagon policy barring troops from political activities.

Stein, a nine-year member of the Corps, said he started the page to encourage fellow service members to exercise their free speech rights. He has also criticized Defense Secretary Leon Panetta for his comments on Syria.