SAO PAULO (AP) — Negative views for the mayor of South America's largest city shot up over the last month, a poll said Tuesday, delivering a blow to his presidential ambitions.

The poll by Datafolha said 39 percent of those surveyed thought Sao Paulo Mayor Joao Doria was "bad or terrible," a sharp jump from 26 percent who felt that way in October.

The already low approval rating for Doria's administration fell three points to 29 percent.

Doria has appeared to be positioning himself as a presidential hopeful who can save Brazil from a seemingly bottomless pit of graft scandals, even while insisting he isn't running as a candidate for the right-leaning Brazilian Social Democracy Party in 2018 elections.

Datafolha interviewed 1,085 people Nov.28-30 and said the poll had a margin of error of three percentage points.