A former police officer will stand trial for his alleged role in the January 6 attack on the US Capitol

After his indictment on charges stemming from the Capitol attack, Thomas Robertson wrote in an online gun forum that the Justice Department had taught rioters a lesson, but definitely not the intended lesson.

Robertson wrote on the website Gunbroker.com that he had learned to cross it and play for all the marbles.

Robertson is going to be the third accused Capitol rioter to stand trial on charges from the January 6 insurrection.

Robertson was an off-duty police officer in Virginia when he and Jacob Fracker went to the Capitol. The two posed in front of a statue of John Stark, a general in the Continental Army during the American Revolution, with Fracker making a gesture.

Both were fired by the police department.

Robertson's trial comes on the heels of previous courtroom victories by federal prosecutors. The first trial connected to the January 6 attack on the Capitol took just hours to return guilty verdicts.

A federal judge found another accused rioter guilty of being on restricted Capitol grounds, but acquitted him of a disorderly conduct charge.

Pressure is mounting on the Justice Department to hold former President Donald Trump accountable for his efforts to overturn the 2020 election.

The New York Times and Washington Post have reported that the Justice Department is investigating the planning of a pro-Trump rally and the attack on the Capitol.

Fracker pleaded guilty in March to conspiring to obstruct the joint session of Congress on January 6.

As part of his plea deal, Fracker agreed to cooperate with the Justice Department and testify that he and Robertson plotted to disrupt the certification of Joe Biden's electoral victory. Fracker could be sentenced to 5 years in prison.

Robertson and Fracker were released after their arrest. Robertson was ordered back to jail by a federal judge in July after the Justice Department presented evidence that he purchased more than 30 firearms. An M4 rifle, a partial pipe bomb, and two fuses were found during a search of his home.

Robertson's past employment as a police officer and social media posts after January 6 that showed a "sincere commitment to violence" were emphasized in court papers.

Robertson, who was a police officer and held a position of public trust, traveled to the District of Columbia and participated in one of the most chaotic acts of insurrection the nation has ever seen.

Robertson was ordered back to jail by Judge Christopher Cooper because he probably committed a new felony by having the firearms shipped on his behalf.

Cooper, an Obama appointee to the federal trial court in Washington, DC, said Robertson appeared to have also attempted to conceal the purchase by attaching the label "Wedding Photos" to a $3,700 transaction over financial transaction platform for the firearms.

The undisputed facts show a concrete risk that Robertson might participate in or provide material support to acts of ideologically motivated violence if released at this time.

Cooper is going to preside over jury selection. Robertson could face years in prison if convicted.