Michael Tan Defensor (, born June 30, 1969) is a Filipino politician and businessman who most recently served as the party-list representative for Anakalusugan from 2019 to 2022. He is also the CEO of Pax Libera Mining, Inc.
Defensor began his political career in Quezon City, where he was a member of the city council from 1992 to 1995. He was elected to the House of Representatives for the city's 3rd district in 1995. In Congress, he was a member of the "Spice Boys", a group of young congressmen who led the efforts to impeach President Joseph Estrada. The impeachment trial and widescale protests of the Second EDSA Revolution resulted in Estrada's resignation and Vice President Gloria Macapagal Arroyo's accession to the presidency. Defensor went on to serve various positions in the Arroyo administration: chairman of the Housing and Urban Development Coordinating Council, Secretary of Environment and Natural Resources, and Malacañang Chief of Staff. He was also appointed to positions at Ninoy Aquino International Airport and the Philippine National Railways.
In 2019, he was elected again to the House of Representatives, representing the Anakalusugan party-list. He was a leading figure among the 70 representatives who voted to deny the franchise renewal of ABS-CBN. During the COVID-19 pandemic, he promoted and distributed the antiparasitic drug ivermectin as a prophylaxis and treatment for COVID-19, despite the lack of scientific evidence supporting its efficacy.
Defensor unsuccessfully ran for Mayor of Quezon City in 2010 and 2022.
He finished elementary, Bachelor of Arts in History, and Masters in Public Administration at the University of the Philippines where he became a member of the UP Alpha Sigma. He finished his secondary education at Niles McKinley High School in Niles, Ohio.
Defensor was elected as a Quezon City councilor from the third district in the 1992 elections at the age of 23, making him the youngest member of that body. He received the Manuel Quezon Bantayog Award for Most Outstanding QC Councilor for the year 1994.
Defensor ran for congressman of the third district of Quezon City against reelectionist Dennis Roldan in the 1995 election, subsequently winning and becoming the youngest congressman at the time. Though he ran under the party of Laban ng Demokratikong Pilipino, he switched to the Liberal Party in June 1995, a month before the 10th Congress convened. He won reelection in 1998.
Defensor was part of the Spice Boys of the House of Representatives that spearheaded the filing of the impeachment case against then-president Joseph Estrada.
After Edsa II, Defensor was appointed as Secretary of the Housing and Urban Development Coordinating Council by President Gloria Macapagal Arroyo. He held that post until August 2004 when he was appointed Secretary of the Department of Environment and Natural Resources.
In the 2004 presidential election, he served as the official campaign spokesperson of President Arroyo. After his tenure as DENR Secretary he was appointed Presidential Chief of Staff. He resigned that post on February 10, 2007, to campaign for a post in the senate.
In June 2008 he was appointed head of Ninoy Aquino International Airport International Passenger Terminal 3 (NAIA-3) by virtue of the June 9, Executive Order No. 732 (creating the Presidential Task Force on the NAIA-3 that was "mandated to ensure the immediate opening and operation of Terminal III.") The order provides for the NAIA-3 opening based on decisions of the Supreme Court and applicable laws.
On October 9, 2008, Defensor was named acting chairman of the Philippine National Railways (PNR).
Defensor was among the first to file for candidacy for the senate on February 12, 2007. Prior to filing, one of his campaign proposals was to temporarily release deposed former president Joseph Estrada from his arrest while his trial at the Sandiganbayan was ongoing, prompting criticism from prosecutors at the trial who called it a "politician's gimmick". He employed popular gossip show host Boy Abunda as his campaign manager. He was named to the TEAM Unity coalition backed by the Arroyo administration. However, he lost the race, placing 15th overall out of the 12 seats.
In the 2022 Philippine general election, Defensor ran for Mayor of Quezon City under the Partido Federal ng Pilipinas (PFP). However, the incumbent Mayor Joy Belmonte emerged victorious in the election.
Defensor is one of the vocal opponents against the franchise renewal of ABS-CBN, together with Sagip Party-list Rep. Rodante Marcoleta and Cavite Seventh District Rep. Jesus Crispin Remulla. He is one of the 70 congressmen who voted "yes" to "kill" (deny) the franchise renewal of ABS-CBN, in favor of the report from the Technical Working Group. After claiming continuous victory, Defensor inititiated an online forum via Zoom and streamed live on Facebook along with Marcoleta, Remulla, Yedda Romualdez, Journalie Payonan, Danilo Fernandez, Jose Antonio Sy-Alvarado, Inno Dy and Alfred delos Santos to discuss the fate of ABS-CBN. On July 18, 2020, they discussed the potential takeover of the ill-fated network due to alleged tampered torrens title, fine for the alleged illegal sale of ABS-CBN TV Plus for almost , and the total closure of Sky Cable as suggested by Rep. LRay Villafuerte. Meanwhile, pro-ABS-CBN advocate Christine Bersola-Babao slammed the forum and called the congresspersons as "evil", and Senate President Tito Sotto slammed the possible takeover of ABS-CBN by calling the compound as constitutionally protected.
In January 2021, Defensor is announced to be part of the new bloc "BTS sa Kongreso" (named after the K-pop boy band group BTS of South Korea), a coalition group formed by Alan Peter Cayetano of the House of Representatives of 18th Congress.
In April 2021, Defensor and SAGIP party-list representative Rodante Marcoleta initiated an "ivermectin pan-three" that distributes the anti-parasitic drug ivermectin, despite warnings from the World Health Organization on the lack of evidence to support ivermectin's efficacy against COVID-19.
Mike Defensor, on July 4, 2008, filed perjury lawsuit versus Rodolfo Noel Lozada for "testifying under oath that he had paid Lozada to change his statement that he was not kidnapped at Ninoy Aquino International Airport (NAIA) when he arrived from Hong Kong at the height of the Philippine National Broadband Network controversy (ZTE Zhong Xing Telecommunication Equipment Company Limited scandal)."
Since 2025, Defensor emerged as a critic to the administration of his former ally, President Bongbong Marcos, leading high-profile legal and political challenges, citing systemic corruption and governance failures. He had publicly called for Marcos's resignation and joined United People's Initiative (UPI) rallies. In January 2026, he led a group of complainants in filing impeachment case against Marcos, but withdrew the document after the office of the House Secretary General declined to accept it.
In February 2026, he was involved in the "Marines Controversy," providing logistics, including a vehicle registered to his wife, for 18 individuals identifying as former Marines. The group alleged they had delivered over in kickbacks to government officials. Malacañang dismissed the claims as a "destabilization plot," while the Philippine Navy reported that several witnesses were either never enlisted or had been dishonorably discharged.
On December 4, 2007, Mike Defensor quietly joined to the board of directors of Petron Corporation with former budget secretary Emilia Boncodin. Defensor had been frequenting Macau. Boncodin stated that Defensor was invited to the board by Nicasio Alcantara, government's team head / Chair, Petron. Membership in the Petron board is a lucrative job, as Defensor was offered a board seat in sequestered United Coconut Planters Bank. Defeated administration candidate, former senator Ralph Recto joined the board of UnionBank, controlled by the Aboitiz family.
Defensor is married to Julie Rose Tactacan, with whom he has five children. Their eldest daughter, Michaela (Mikee), is a lawyer who is a member of the Philippine Anti-Dynasty Network.
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