The election for the ruling People Power Party's(PPP) leadership is shaping up to be a four-way race as three major candidates announced their bids on Sunday. 

Former PPP interim leader Han Dong-hoon, five-term Rep. Na Kyung-won and former land minister Won Hee-ryong declared their candidacies Sunday afternoon at the National Assembly, following Rep. Yoon Sang-hyun’s bid on Friday. 

Han, who is considered a strong favorite for the position, said he would seek to reestablish a horizontal relationship between the party and the government. He also said he would propose a bill on a special counsel probe into alleged state interference in the investigation of a Marine's death last year. 

Na claimed to be the right person to bring unity and balance, emphasizing her experience as a five-term lawmaker, while Won stressed his ability to communicate smoothly with the presidential office.

The PPP is scheduled to hold a party convention on July 23 to elect a new leadership.