Prime Minister Shinzo Abe will urge U.S. President Donald Trump to dismiss Pyongyang's assertion that the issue of Japanese nationals abducted decades ago has been resolved when the president meets with North Korean leader Kim Jong Un, government sources said Monday.

Abe will meet with Trump in Washington on Thursday, before the U.S. leader's unprecedented summit with the North Korean leader scheduled for June 12 in Singapore.

The White House said Monday that the summit — the first between a sitting American president and a North Korean leader — will begin at 9 a.m. in the city-state. Other details of the summit remain unclear.