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MANILA - The new Pulse Asia survey showed senatorial prospects closely associated with the Duterte administration saw a decline in their rankings, the research firm's president said on Tuesday.

Pulse Asia President Ronnie Holmes cited as examples Davao City Mayor Sara Duterte and Bureau of Corrections director Ronald "Bato" dela Rosa's rankings in the new poll.

Holmes said this may be the result of the issues and developments that transpired within the survey period, such as President Rodrigo Duterte's move to nullify Senator Antonio Trillanes IV's amnesty and the country's soaring inflation.

"In the survey, we saw a significant decline also in terms of the preference for Mayor Sara Duterte. It's about close to 7 percentage points decline but it's sufficient to land her fifth, in a safe ranking," Holmes told ANC's Beyond Politics.

"In the survey, we see people expressing much more concern for the increase in prices of commodities than what we've seen in the past 2 years."

The younger Duterte slid a rank down in Pulse Asia's September survey to fifth from the fourth spot.

Dela Rosa, meanwhile, did not make it to the top 12 compared with his seventh rank in the June senatorial survey.

Duterte's top aide, Christopher "Bong" Go, only placed 22nd to 27th in the poll.

Communications Assistant Secretary Mocha Uson, who claims to have more than 5 million followers on Facebook, only ranked 46th to 53rd in the survey.