From July 18 to July 27, Macron's approval rating went down from 41 percent to 37 percent, the results of the survey published by Le Journal du Dimanche on Sunday showed.
The high-profile case broke out earlier in July after a video emerged capturing Alexandre Benalla in riot police gear, tackling a young demonstator to the ground and punching him repeatedly before fleeing. Last week, the prosecutor's office launched a preliminary investigation into the incident, while Elysee Palace announced its decision to fire Benalla.
READ MORE: Le Pen Backs Censure of Macron for 'Trying to Hide Facts' in Aide Assault Case
Benalla, last week, was indicted and placed under judicial control. Benalla has been slapped with multiple charges, including violent acts, interfering in the work of public services, wearing an official insignia without authorization, concealing video materials and breaching professional secrecy.
Macron, commenting on the case, said he was disappointed with Benalla's actions, which he regarded as a betrayal.