President Benigno Aquino has congratulated presumptive president Rodrigo Duterte for winning the 2016 elections, an aide of the Davao City mayor said Tuesday.

Duterte's executive assistant, Christopher Bong Go, said Aquino has also opened talks for the convening of transition teams to pave the way for Duterte's assumption of office.

Go said Aquino is expected to issue soon an executive order creating Malacanang's transition team, with the Duterte camp just about ready.

He said the mayor is still overwhelmed by the grueling 90-day campaign.

Go added that Duterte is feeling the effects of extreme fatigue, which prompted him to take the day off.

He said the mayor did not grant any interviews and did not make any public appearance Tuesday. Duterte went to an undisclosed place in Davao to take a much needed rest.

Go could not say when the mayor would resume public appearances.

Duterte's running mate, Sen. Alan Peter Cayetano, also said they needed to destress from the bruising campaign.

Cayetano said he is likely to finish his remaining term in the Senate and decline Duterte's offer of a Cabinet post, considering too that there is a one-year ban on appointing losing candidates to government positions.

BROAD COALITION

Duterte's spokesman earlier said that the presumptive president will build a broad coalition of legislators to push for his agenda, including a shift to a federal-parliamentary system of government.

The tough-talking mayor expects members of other parties to either switch or align themselves with his own PDP-Laban, spokesman Peter Laviña told reporters.

Duterte will also pursue a "major rewriting" of the three-decade-old Constitution to shift to a federal parliamentary form of government and ease foreign ownership restrictions on business, Lavina also said. - with a report from Joel Guinto, ABS-CBN News