Quebec supporters of French presidential candidate Nicolas Sarkozy are asking for police protection leading up to this weekend's vote.

The right-wing politician's Montreal campaign headquarters were vandalized Sunday night. Graffiti and expletives were spray-painted on the office's windows and printed posters were glued across the building's front facade.

Sarkozy's Quebec campaign manager said it's not the first time the office has been threatened. "I received calls: one was insulting, the other threatening me on this," Hradija DuKalli said Tuesday.

DuKalli has asked police to increase surveillance around the office leading up to Saturday's vote.

Police said they're looking for three suspects in connection to the office vandalism. DuKalli's staff installed a video camera inside their office during the campaign and have footage from the night the vandalism was committed.

Montreal police said they will increase patrols to ensure French-born Quebec voters are safe on Saturday.

Sarkozy's Montreal office is his biggest outside Europe. There are some 34,000 French voters living in Montreal, the greatest number outside France.