DAVAO CITY - President-elect Rodrigo Duterte opted to perform his tasks as mayor of Davao City on the day of his proclamation in Congress as the winner of the presidential race.

“He is doing his chores as mayor of Davao. Madami pa documents for signature,” said Bong Go, Duterte’s trusted aide, in a text to reporters Monday.

Duterte will officially become the 16th President of the Philippines on June 30, the day of his inauguration.

Duterte technically remains the mayor of Davao City and he will be replaced by his daughter, Sara, who won the mayoralty race.

Duterte told reporters on Sunday that he has never attended any proclamation in his entire political career.

"I’m not attending any proclamation. I’ve never attended any proclamation in my life . In all of my political aspirations, nanalo naman ako," he said.

"Sabi ko nga baka God would want me to taste defeat but it never happened.”

Duterte garnered 16,601,997 votes in the final and official tally, edging closest rival, former interior secretary Mar Roxas, who got 9,978,175 votes.

Veteran election lawyer Romulo Macalintal earlier urged Duterte to rethink his plans of missing the event, saying that the proclamation is an age-old tradition that the incoming president should honor.

"Although it is not mandatory for the winner to be personally present, his presence will show his reverence and respect to the Congress of the Philippines which is mandated by law to canvass the results and proclaim the winners for president and vice president," Macalintal said.

Macalintal said Duterte's attendance will also make his voters happy.

Vice president apparent, Leni Robredo attended the proclamation.