President Yoon Suk-yeol at the presidential office in Seoul's Yongsan District, July 29. Korea Times photo by Seo Jae-hoon

President Yoon Suk-yeol's approval rating has sunk to the lowest since he took office in May, amid controversies over his personnel appointments and leadership turmoil in the ruling party, a poll showed Friday.

Yoon's approval rating came to 24 percent, down 4 percentage points from the previous week, while 66 percent negatively assessed his handling of state affairs, up 4 percentage points. The poll was conducted by Gallup Korea on 1,001 voters nationwide from Tuesday to Thursday.

Yoon's approval rating more than halved from 53 percent and his disapproval rating doubled from 33 percent since the second week of June.

In Friday's poll, the rate of negative assessment was higher in most of responding groups, except for those in their 70s or above and ruling People Power Party (PPP) supporters.