Prime Minister Shinzo Abe said Sunday he will try to persuade lawmakers from the Democratic Party of Japan, the main opposition force, to support his bid to amend the Constitution after the Upper House election.

Abe told reporters in Warsaw that he will try to secure the two-thirds majorities of both Diet members required to amend it.

"There must be lawmakers supporting revisions of some articles of the Constitution not only in Nippon Ishin no Kai (Japan Restoration Party) and Your Party, but also in the DPJ," the prime minister said, conceding that it will be impossible to secure enough seats only through the election to push through amendments solely via his ruling Liberal Democratic Party and partner New Komeito.