Seoul, May 2 -- Han Duck-soo, South Korea's former prime minister, on Friday announced his presidential run after stepping down on the previous day.

Han told a televised press conference in the National Assembly that he will run for president in the June 3 election as he made up his mind to find what he can do for the future of the country, vowing all-out efforts to be selected by the people in the upcoming presidential election.

If elected president, Han said he would make all-out efforts to amend the constitution and hold parliamentary and presidential elections simultaneously in the third year of his five-year term in accordance with the new constitution.

Han pledged that he would immediately resign as president after the elections,...