I am a Filipino lawyer, politician, and former law professor serving as the Presidential Spokesperson of President Rodrigo Duterte. I first served as Duterte's Presidential Spokesperson from 2017 to 2018 and was reappointed in April 2020. I previously served as the Party-list Representative of KABAYAN from 2016 to 2017.

I taught constitutional law and public international law for 15 years at the University of the Philippines College of Law. Among the notable cases he handled are the Maguindanao massacre and Jennifer Laude cases.

I was also requested by President Rodrigo Duterte to be his presidential spokesperson, and on October 27, 2017, I was officially appointed, replacing Ernesto Abella. On November 22, 2017, I was designated presidential adviser for human rights concurrent with being the presidential spokesperson.

I am also a member of the Advisory Council of the Asian Society of International Law (AsianSIL) and was president of AsianSIL from 2018 to 2019.