Yoon Suk Yeol’s ouster over his martial-law decree triggers a snap vote to elect a leader who will face challenges on trade, U.S. relations and North Korea.

SEOUL — A paradox in the four-month-long drama that began with Yoon Suk-yeol’s attempt at imposing martial law over South Korea and ended with his ouster as president is that his People Power Party gained popularity.

The ruling caps months of political turmoil that have overshadowed efforts to deal with the new administration of U.S. President Donald Trump at a time of slowing growth.