Estrada resigned Process_end and was succeeded Change_of_leadership by his Vice-President , Gloria Macapagal-Arroyo , who was sworn into office by then-Chief Justice Hilario Davide Jr. at around noon on January 20 , 2001 , several hours before Estrada fled Malacañang Palace .

The impeachment trial was formally opened Openness on November 20 , with twenty-one senators taking their oaths as judges , and Supreme Court Chief Justice Hilario Davide , Jr. presiding .