South Korea’s former Prime Minister Han Duck-soo said on Friday he will run in next month’s presidential election and would seek to lessen the powers of the office and ease strife-ridden domestic politics if he wins.

Han’s entry heats up the scramble among conservatives to unify behind a candidate to compete with liberal front-runner Lee Jae-myung, whose campaign recently was set back by a court decision to open a new trial on election law violation charges.