MANILA, Philippines — National Bureau of Investigation (NBI) Director Melvin Matibag on Tuesday told the Senate impeachment court he was “100 percent” certain that Vice President Sara Duterte hired a hitman to carry out the alleged killings of President Ferdinand Marcos Jr., first lady Liza Araneta-Marcos and former speaker Ferdinand Martin Romualdez.The statement came during the interpellation of Senator-judge Bam Aquino, who asked Matibag for …