SEOUL: South Korea’s left-wing presidential frontrunner Lee Jae-myung proposed on Friday to amend the constitution to make it more difficult to impose martial law, aiming to prevent political crises like the one that erupted last year.

As candidates entered their final stretch before the snap presidential election on June 3, Lee and his Democratic Party urged South Koreans to come out to vote to end the political turmoil that has gripped the country since ousted conservative leader Yoon Suk Yeol’s short-lived martial law declaration in December.

“Our national prestige has fallen, but it (martial law) happens. We have to make that impossible systematically,” Lee told a live-streaming talk show on YouTube.

“Overcoming the insurrection (crisis) is no-brainer. Without it, our country will collapse,” Lee said, adding that economic growth and unity would be among his other top priorities.

Lee said he would seek to revise the constitution to strengthen martial law requirements, for instance by not allowing leaders to implement martial law without getting parliament’s approval within 24 hours.

More South Koreans turned out for early voting on Friday after reaching record numbers on Thursday. Early voting ends at 6 p.m. (0900 GMT) on Friday.

As of noon on Friday, 25.8 percent of eligible voters had voted, the highest turnout compared to other polls in the same period.

Lee also said a special prosecutor should investigate the December 3 martial law incident to make sure those responsible were punished, although he called for leniency for those in the military who were reluctant to follow orders.

Yoon Yeo-jun, chair of the Democratic Party’s election campaign, said that the vote would be an opportunity to set the country right so that the “Yoon Suk Yeol tragedy would never happen again.”

Kim Moon-soo, Lee’s rival candidate from the conservative People Power Party, said he would stop “legislative dictatorship” by Lee’s Democratic Party that holds a majority in parliament.