Sixto Brillantes was the general counsel of the Nationalist People's Coalition from 2001 to 2006, then was a legal consultant of United Opposition from 2007 to 2009.
From 2001 to 2006, he was the general counsel of the Nationalist People's Coalition, a political party founded by Cojuangco. He then was a legal consultant of United Opposition, a party founded by Jejomar Binay, from 2007 to 2009. 
