Is dual citizenship allowed? If yes, can persons with dual citizenship run for public office?

YES. The concern of the Constitutional Commission was not with dual citizens per se but with naturalized citizens who maintain their allegiance to their countries of origin even after their naturalization The fact that a person has dual citizenship does not disqualify him from running for public office. (Cordora v. COMELEC, G.R. No. 176947, February 19, 2009) Candidates with dual citizenship can run for public office provided that upon the filing of their certificates of candidacy, they elect Philippine citizenship to terminate their status as persons with dual citizenship. (Mercado vs. Manzano, G.R. No. 135083, May 26, 1999)