SEOUL - The approval rating of South Korean President Park Geun Hye, who is embroiled in an explosive political scandal, has dipped 1 percentage point from last week to a new all-time low of 4 percent, according to a Gallup Korea poll published Friday.

According to the poll, conducted on 1,004 South Koreans from Tuesday to Thursday, Park's disapproval rating rose 3 percentage points to 93 percent.

South Korea's main opposition Democratic Party of Korea and two other opposition parties said Thursday they will seek to have the opposition-controlled parliament vote by as early as Dec. 2 on a motion to impeach Park over her involvement in the influence-peddling scandal involving her confidante Choi Soon Sil.

Choi was indicted on Sunday on charges of using her relationship with Park to win sizeable donations from corporations for her nonprofit foundations.

Prosecutors also announced Sunday that Park is a suspect in a widening investigation into the scandal involving Choi and two former presidential secretaries.

Under South Korea's Constitution, a sitting president cannot be prosecuted for less than serious criminal offenses such as insurrection. However, a president can be punished if he or she resigns or is impeached.

The deepening scandal triggered massive street protests, demanding Park step down or face impeachment. Park, whose five-year term ends in February 2018, has refused calls to resign, but publicly apologized twice since the scandal erupted late last month.