Special counsel Robert Mueller’s team is attempting to postpone the first court hearing related to charges against several Russian companies and Russian citizens that they say attempted to use social media to meddle in the 2016 election.

Mueller’s office earlier this year revealed that the 13 Russian nationals were indicted on charges of conspiracy to defraud the U.S. Additionally, three defendants were charged with conspiracy to commit wire fraud, and five were charged with aggravated identity theft.

Those charged were not expected to appear in the U.S. court. However, last month, two Washington-area lawyers alerted the court that they represent one of the businesses that was charged, Concord Management, according to Politico. Mueller’s team wants a delay because it’s unclear whether the lawyers from Concord Management formally accepted the summons from the court case.

Judge Dabney Friedrich has not issued a ruling on the request and has not approved a delay of the court hearing, but she did instruct Concord’s attorneys to respond to Mueller’s filing by Monday.

Deputy Attorney General Rod Rosenstein, who is overseeing Mueller’s probe, revealed in February that the alleged meddling by the Russian businesses and citizens started in May 2014 and that the Russian groups created posts, ads, and organized events on social media platforms by using names of Americans and other entities.

The ads primarily were found to be primarily in opposition to Democratic nominee Hillary Clinton, but at times were against President Trump.