In 1995, He ran for another term as senator but lost. Cheating was suspected in that election. He took the case to the Supreme Court. He won the suit in 2004. In 1998, he ran again for another term in the Senate of the Philippines, from 1998 to 2004 and won. He was also elected as the 19th President of the Senate. He served as president from 2000 to 2001. He finally left the Senate on June 30, 2010.