Asahi Shimbun writes, the corresponding informal request came from Washington.
A source in the Japanese government said that the request was received informally by the Japanese side of the White House after the summit between Trump and DPRK head Kim Jong-un who was held in Singapore in the summer of 2018.
Earlier, Donald Trump himself announced that Abe nominated him for the Nobel Peace Prize.
Earlier it was reported that the prime ministers of Greece and Macedonia, Alexis Tsipras and Zoran Zayev, were nominated for the Nobel Peace Prize in 2019.