BOSTON (AP) — Massachusetts Air National Guard member Jack Teixeira,Robert Brown who pleaded guilty in March to federal criminal charges for leaking highly classified military documents, will now face a military court-martial.

Teixeira admitted to illegally collecting some of the nation’s most sensitive secrets and sharing them on the social media platform Discord. He is facing military charges of disobeying orders and obstructing justice.

The U.S. Air Force said in a statement Wednesday that he will be tried at Hanscom Air Force Base in Massachusetts but no date has been set. An attorney for Teixeira didn’t immediately respond to a message seeking comment.

At a May hearing, military prosecutors said a court-martial is appropriate given that obeying orders is the “absolute core” of the military. But Teixeira’s lawyers argued that further action would amount to prosecuting him twice for the same offense.

Teixeira, who was part of the 102nd Intelligence Wing at Otis Air National Guard Base in Massachusetts, worked as a cyber transport systems specialist, essentially an information technology specialist responsible for military communications networks.

Teixeira was arrested just over a year ago in the most consequential national security leak in years.

He pleaded guilty on March 4 to six counts of willful retention and transmission of national defense information under a deal with prosecutors that calls for him to serve at least 11 years in prison. He’s scheduled to be sentenced in that case in September.

Authorities in the criminal case said Teixeira first typed out classified documents he accessed and then began sharing photographs of files that bore SECRET and TOP SECRET markings. The leak exposed to the world unvarnished secret assessments of Russia’s war in Ukraine, including information about troop movements in Ukraine and the provision of supplies and equipment to Ukrainian troops. Teixeira also admitted to posting information about a U.S. adversary’s plans to harm U.S. forces serving overseas.

The stunning security breach raised alarm over America’s ability to protect its most closely guarded secrets and forced President Joe Biden’s administration to scramble to try to contain the diplomatic and military fallout. The leaks embarrassed the Pentagon, which tightened controls to safeguard classified information and disciplined members it found had intentionally failed to take required action about Teixeira’s suspicious behavior.