Iranian judiciary leaders have declared that opposition leaders Mir Hossein Mousavi and Mehdi Karroubi will stand trial for sedition, according to several reports. This news comes shortly after 220 members of the Iranian parliament signed a letter calling on the judiciary to prosecute the two opposition leaders.

The deputy chief of the judiciary for Legal and Judicial Development told the Fars News Agency that the “judiciary will definitely fulfill its duty with regard to the trial of Mousavi and Karroubi,” according to the Washington Times. “People should know that the judiciary will not ignore its duty with regard to the trial of sedition masterminds and will try them in due time.”

Iran’s Judiciary Chief Ayatollah Sadeq Larijani also indicated that the trial would occur but called on government supporters to be patient.

“We ask everybody to allow the judicial system to work within the framework of law and observe the interests of the system,” he told the Mehr News Agency on Thursday, according to People’s Daily Online. He added that, once the judiciary system investigates the sedition case, it “for sure will not come short in this regard.”

Like many offenses, sedition is punishable by death in Iran. And while the Iranian government has expressed an eagerness to prosecute Mousavi and Karroubi, such a trial could also result in a backlash against the government and serve as an even greater rallying cry for the Green movement.