Both declared and undeclared candidates for the Liberal Democratic Party's presidential election began making their cases for prime minister Friday in a high-profile panel discussion viewed as a prelude to the Sept. 20 poll.

The discussion, organized by the LDP's Tokyo chapter, is the first in a series of policy debates that will be held across the country.

Chief Cabinet Secretary Shinzo Abe, a conservative hawk widely considered the front-runner in the race who has yet to declare his candidacy, participated in the discussion, as did Finance Minister Sadakazu Tanigaki, who threw his hat into the ring Thursday.