His current lawyer, Marcel Guérin, will seek permission to remove himself from the case on Friday afternoon.
He will present a motion to Judge Guy Cournoyer saying he can no longer represent Bain because there is no longer any trust between him and his client.
Bain has worked with several lawyers and has represented himself in court as well.
Guérin took over the case in May.
Bain is charged with first-degree murder and attempted murder after an attack at a Montreal venue in September 2012 as Pauline Marois celebrated the Parti Québécois election victory.
Lighting technician Denis Blanchette was fatally shot and colleague David Courage was wounded as they stood near a doorway to the downtown Metropolis music venue where Marois was giving her speech.
Bain also faces several weapons charges as well as some relating to arson in the same incident.
If the judge grants Guérin’s motion, it could delay the start of the trial, due to begin at the start of next year.