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

After months of political turmoil, South Koreans will head to the polls Tuesday to elect a president to succeed disgraced former leader Yoon Suk Yeol, who was ousted from office over his ill-fated decision to impose martial law in December.

The country is battling to draw a line under months of political turmoil sparked by Yoon Suk Yeol’s brief suspension of civilian rule in December, for which he was impeached and removed from office