Prime Minister Shinzo Abe plans to call for concrete discussions on revising the Constitution in his policy address before the Diet later this week, according to an outline of his planned speech made available to Kyodo News.

Abe, a longtime advocate of amending the Constitution, is poised to make the pitch as this year marks the 70th anniversary of the supreme law's enforcement.

Abe, who on Tuesday night returned from a tour of three Southeast Asian nations and Australia, will work out the detailed contents of the speech with the government and the ruling parties beginning Wednesday, it was learned Tuesday.