By Ju-min Park and Jack Kim
SEOUL (Reuters) - South Korean lawmakers voted overwhelmingly on Friday to impeach President Park Geun-hye over an influence-peddling scandal, setting the stage for her to become the country's first elected leader to be expelled from office in disgrace.
The impeachment motion was carried by a wider-than-expect 234-56 margin in a secret ballot in parliament, meaning more than 60 of Park's own conservative Saenuri Party members backed removing her. The votes of at least 200 members of the 300-seat chamber were needed for the motion to pass.
The Constitutional Court must now decide whether to uphold the impeachment, a process that could take up to 180 days.
"I solemnly accept the voice of the parliament and the people and sincerely hope this confusion is soundly resolved," Park told a Cabinet meeting, adding that she would comply with the court's proceedings as well as an investigation by a special prosecutor.
Park, whose approval rating stands at just 5 percent, has resisted demands that she step down immediately.
Under the constitution, Park's duties were assumed by Prime Minister Hwang Kyo-ahn on an interim basis until the court rules.
"I stand here with heavy-hearted sadness," Hwang said in a televised address. "As an aide to the president, I feel deep responsibility about the situation we have come to face."
Cheers had erupted outside the chamber of the domed parliament building when the vote was announced. People held signs saying "Victory for the People" and "New Republic of Korea".
Earlier, anti-Park activists scuffled with police as they tried to drive two tractors up to parliament's main gate.
Choi Jung-hoon, a 46-year high school teacher, joined the rally outside parliament with his wife and daughters, age 7 and 18 months.
"I wanted my kids to be here, making history, at a historic moment, and show we people can win," he said.
Park, 64, is accused of colluding with a friend and a former aide, both of whom have been indicted by prosecutors, to pressure big businesses to donate to two foundations set up to back her policy initiatives.
Park, who is serving a single five-year term that was set to end in February 2018, has denied wrongdoing but apologized for carelessness in her ties with her friend, Choi Soon-sil.
If Park leaves office early, an election must be held within 60 days.
The poll frontrunners are United Nations Secretary-General Ban Ki-moon and ex-lawmaker Moon Jae-in, the former leader of the main opposition Democratic Party, who lost the 2012 election to Park by 3 percentage points. [L4N1E42ZO]
"The Secretary-General is confident that the people of the Republic of Korea will overcome the present difficulties through unity and resilience as well as a strong commitment to democratic institutions and principles," Ban spokesman Stephane Dujarric said in a statement.
Ban has not said whether he will seek the presidency when his term finishes at the end of the year.
"The power of candles has made a big change without any arrest or casualty," said third-placed presidential hopeful Lee Jae-myeong, mayor of the city of Seongnam, referring to the candle-lit anti-Park rallies that have drawn huge, peaceful crowds to central Seoul for the last six Saturdays.
Another rally is planned for this weekend.
"It has opened up a new era in the history of the Republic of Korea's democracy," Lee, who has said he wants to be the South Korean Bernie Sanders, told Reuters.
South Korea's main ally, the United States, said it was watching events closely and praised South Koreans for acting "peacefully, with calm and responsibility." White House spokeswoman Emily Horne said the alliance would continue to be "a linchpin of regional stability and security."
"We look forward to working with Prime Minister Hwang in his new capacity as acting president," she said. "We expect policy consistency and continuity across a range of fronts, including (North Korea), other regional issues, and international economics and trade."
Kang Dong-wan, a professor at Dong-A University in Busan, said the large impeachment vote from Park's own party was probably a result of rising crowds at weekly demonstrations.
"It looks like more from the ruling Saenuri Party gave their support than many had expected after realizing that the party could collapse if the bill doesn't get approved," Kang said.
Hwang, whose post is largely ceremonial, assumes presidential powers at a time of heightened tension with North Korea, and said after the vote that the chances of a provocation by Pyongyang were high.
Various agencies, including the Finance Ministry and financial regulators, planned emergency meetings.
South Korea's economic outlook is also worsening, in part because of the domestic political uncertainty.
Investors are likely to be spooked when trading resumes on Monday and remain jittery until the Constitutional Court ruling, analysts said. The won <=KRW> was forecast to lose further ground against the dollar on Monday.
PRESIDENTIAL IMMUNITY - FOR NOW
The daughter of a military ruler who led the country for 18 years before being assassinated by his disgruntled spy chief in 1979, Park would lose presidential immunity if she left office early, and could be prosecuted for abuse of power and bribery, among other charges.
The Constitutional Court will determine whether parliament followed due process and whether there were sufficient grounds for impeachment. Arguments from the two sides will be heard in public hearings, which Park is unlikely to attend.
The nine-member Constitutional Court is considered conservative in its make-up, but some of its former judges have said the case against Park is strong and likely to be approved.
In 2004, parliament impeached then-president Roh Moo-hyun, suspending his powers for 63 days while the court reviewed the decision, which it overturned. Unlike now, on that occasion public opinion was against Roh's impeachment.
The prime minister at the time, Goh Kun, said in a 2013 memoir that he had decided to stay "low-key" while he held the reins of power.
(Additional reporting by Cynthia Kim, Se Young Lee, Joyce Lee, Kim Daewoung, Jeong Eun Lee and Nataly Pak in Seoul, Michelle Nichols at the United Nations, and David Brunnstrom and Matt Spetalnick in Washington; Writing by Tony Munroe; Editing by Alex Richardson and Bill Trott)