Claim: Miriam Defensor Santiago 2016 presidential campaign was announced on October 13, 2015 at a book signing event where she submitted her certificate of candidacy on October 16, 2015.
Evidence: The 2016 presidential campaign of Miriam Defensor Santiago, a then-incumbent Senator of the Philippines, was announced on October 13, 2015 at a book signing event. Miriam Defensor-Santiago submitted her certificate of candidacy (COC) on October 16, 2015.