Prime Minister Shinzo Abe is gunning for support from parties, including Tokyo Gov. Yuriko Koike's Kibo no To (Party of Hope), on amending the Constitution after the Oct. 22 Lower House election.

In an interview Friday, ahead of the start of official campaigning on Tuesday, Abe said his Liberal Democratic Party will seek to cooperate broadly with other parties in proposing a first-ever revision to the 70-year-old Constitution.

"While deepening the debate within our party, we want to cooperate with any other party," Abe said.