Manila, Feb. 7 -- Presidential son and Ilocos Norte Rep. Sandro Marcos on Friday defended his decision to be the first to sign the impeachment complaint against Vice President Sara Duterte, citing his constitutional duty and the severity of the allegations.

"Well, katulad po sa sinabi ng ating Pangulo ay nung nagpirmahan na sa impeachment complaint ay tinanong ko siya kung ano ba ang advice niya. And tama naman yung sinabi niya (As the President said, when the impeachment complaint was signed, I asked him what his advice was. And he was right when he said): 'Do your duty as a congressman and uphold your oath to the Constitution that you swore to protect,'" Marcos said in an interview.

"It is my constitutional duty to go through the impe...