SEN. Antonio Trillanes 4th pleaded not guilty to libel charges, which President Rodrigo Duterte’s son and son-in-law filed against him before a Davao City court, according to a radio report on Tuesday.

Former Davao City vice mayor Paolo Duterte and lawyer Manases Carpio filed several libel cases against Trillanes who linked the two to an extortion scheme involving transport network vehicles (TNVs).