MANILA, Philippines—The issue of electing a new presiding officer was the first issue debated by senator-judges when the impeachment trial of Vice President Sara Duterte began on Monday. READ: Senate majority picks Escudero to preside over Sara Duterte trial Senate President  Sherwin Gatchalian, who presided over the proceedings when the impeachment court opened around 2:00 p.m.,  called for the election of