Former supermodel and French first lady Carla Bruni-Sarkozy was given preliminary charges Tuesday for involvement in alleged efforts to pressure a witness who accused ex-President Nicolas Sarkozy of receiving illegal campaign financing from Libya.

Bruni-Sarkozy was placed under judicial supervision on Tuesday, which included a ban on contact with all those involved in the proceedings with the exception of her husband, according to a judicial official not authorized to be publicly named when…