R. Kelly’s defense team is requesting that a court postpone the singer’s sex trafficking trial, which is slated to begin in August.

According to the Associated Press, lawyer Deveraux Cannick wrote to U.S. District Judge Ann Donnelly on Tuesday, claiming that the singer’s mandated prison quarantine—which ends on Tuesday—has prohibited them from preparing for trial. Kelly was transferred from a Chicago prison to the Metropolitan Detention Center in Brooklyn late last month.

Attorney Cannick has claimed that Kelly is willing to appear in court, but not “at the expense of his Sixth Amendment rights.” Kelly and his legal team will be compelled to hold sessions using one of a limited number of jail conference rooms when the mandated quarantine ends, according to Cannick. Should there be no available space as such, the team will have no choice but to hold their sessions besides other inmates.

According to reports, prosecutors have yet to respond to Cannick’s letter as of this writing and judge Donnelly is also yet to rule on the request.