(CNN) Lawyers for actor Jussie Smollett filed a motion Thursday opposing the appointment of a special prosecutor to review the dismissal of charges against him.

Retired Illinois Appellate Justice Sheila O'Brien filed a petition on April 5 requesting a special prosecutor be appointed to review Cook County State Attorney Kim Foxx's decision to dismiss charges against Smollett, whom investigators said staged an attack against himself.

Smollett's lawyers argue in the motion that a review by a special prosecutor is only allowed when there is a pending case.

They also said a review by a special prosecutor would be redundant as the Cook County Inspector General has already announced an investigation into how the office handled the case.

The Inspector General's investigation is being conducted at Foxx's invitation.

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