Prime Minister Taro Aso will send a letter to U.S. President Barack Obama to convey his intention of working with the United States to eradicate nuclear weapons, a senior Liberal Democratic Party lawmaker said Monday.

At an LDP executive meeting Monday, Aso stressed that Japan would make its own efforts to realize a nuclear-free world, LDP Secretary General Hiroyuki Hosoda later told reporters.

Obama was in Prague for a U.S.-EU summit when he vowed the U.S. would strive for a world free of atomic weapons.

Asked by reporters in the evening to be more specific about what he wrote in the letter, Aso declined comment.