Prime Minister Yoshihide Suga and U.S. President Donald Trump agreed on Sunday night to further strengthen the Japan-U.S. security alliance, in their first phone call since the new Japanese leader took office.

Suga, elected by the Diet as Japan's first new leader in nearly eight years on Wednesday, told reporters after talks with Trump that he told the U.S. leader the alliance is the "cornerstone of peace and stability in the region."

Trump was quoted by Suga as saying the alliance should be strengthened even further and that Suga is welcome to call him "24 hours a day."