U.S. President Donald Trump is expected to be invited to Japan for around three days from May 26, possibly making him the first foreign state guest to meet Crown Prince Naruhito after his planned accession to the throne, a Japanese government source said Monday.

The government is apparently seeking to demonstrate strong Japan-U.S. ties by receiving Trump as the first foreign head of state to be treated with utmost courtesy after the Imperial accession on May 1.

"The United States is the most important country for Japan. Mr. Trump is the most suitable (foreign guest) to meet the new Emperor first," one of the sources said.