Karti Chidambaram, the son of Congress leader P Chidambaram, arrived at the CBI office today for questioning in a corruption case following a Supreme Court order. "My petitions in court speak for themselves," the 45-year-old told NDTV as he walked in. The court has said Karti Chidambaram's lawyer can accompany him to the CBI office but sit in an adjoining room during his questioning.