SEOUL (AFP) - South Korean President Park Geun Hye will not answer questions from prosecutors over a snowballing influence-peddling scandal rocking her presidency, her lawyer said on Monday (Nov 28).

Prosecutors describe Park and her secret confidante, Choi Soon Sil, as co-culprits in the scandal. They are accused of coercing top Seoul firms to donate over US$60 million (S$85 million) to non-profit foundations, some of which Choi allegedly used for personal gain.

Choi was charged last week with coercion and abuse of power.

The scandal has sparked nationwide fury, with hundreds of thousands taking to the streets to call for Park's ousting.

A parliamentary vote to impeach her could take place as early as this week as a growing number of ruling party politicians back the opposition-led campaign to oust the president.

Park earlier vowed to cooperate "sincerely" with the legal probe but has rejected a series of requests in recent weeks by prosecutors to make herself available for questioning.

"We regret that we can't cooperate with the request from prosecutors to hold face-to-face questioning on November 29," Yoo Young Ha, Park's lawyer, told reporters.

Seoul prosecutors gave Park an ultimatum last week, saying Tuesday is the final deadline for questioning before a powerful independent team of investigators takes over the probe in December.

But Park - the first South Korean president to become a criminal suspect while in office - is too busy handling state affairs and preparing a legal defence against the mounting accusations, Yoo said.

It is not clear whether Park will cooperate with the new independent investigative team.

As a sitting president, Park cannot be charged with a criminal offence except insurrection or treason, but she can be investigated and potentially charged once her term is over.

Justice Minister Kim Hyun Woong offered his resignation last week as tension grew between the presidential office and the prosecutors.

Park on Monday accepted the resignation.

The president is also accused of letting Choi, daughter of a shady religious figure who was a longtime mentor to Park, meddle in state affairs including the nomination of top officials.