Yoshihide Suga, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Fumio Kishida, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, on Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Shigeru Ishiba, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Fumio Kishida (L), a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga (2nd R), a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Shigeru Ishiba, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Fumio Kishida, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga (R), and Shigeru Ishiba, candidates for the next leader of the Liberal Democratic Party (LDP), attend a speech session for the LDP's leadership election at its headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Kim Kyung-Hoon/Pool via Xinhua)

Yoshihide Suga (R), a candidate for the next leader of the Liberal Democratic Party (LDP), bows before presenting his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Fumio Kishida, a candidate for the next leader of the Liberal Democratic Party (LDP), presents his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga (C), Fumio Kishida (R) and Shigeru Ishiba, candidates for the next leader of the Liberal Democratic Party (LDP), attend a speech session for the LDP's leadership election at its headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Kim Kyung-Hoon/Pool via Xinhua)

Shigeru Ishiba (L), a candidate for the next leader of the Liberal Democratic Party (LDP), bows after presenting his policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)

Yoshihide Suga (C), Fumio Kishida (R) and Shigeru Ishiba, candidates for the next leader of the Liberal Democratic Party (LDP), bow after presenting their policy ideas to party members at LDP's headquarters in Tokyo, Japan, Sept. 8, 2020. Campaigning officially kicked off Tuesday for the ruling LDP's top post with three candidates vying for the position to succeed Prime Minister Shinzo Abe. (Xinhua/Du Xiaoyi)