Gloria Macapagal-Arroyo
As an advocate of good governance, TG Guingona also pushed for transparency in budgetary procedures and promoted reform in the national budgeting system. When evidence of electoral cheating by then President Gloria Macapagal-Arroyo became public, TG Guingona actively endorsed and pursued her impeachment. The cheating in the Presidential election by Gloria Macapagal-Arroyo became known as the Hello Garci Scandal.