U.S. President Donald Trump put a period on the looming end of his bromance with outgoing leader Shinzo Abe on Monday, lauding him as “the greatest Prime Minister in the history of Japan.”

Trump made the comments in a tweet praising Abe after the two spoke over the telephone in what was likely to be their final call as leaders of the two allies after Japan's longest-serving prime minister announced last Friday that he would be resigning due to a chronic illness.

In their Monday morning phone call — the pair’s 37th — Abe said Japan would continue working to develop new national security policies, with the missile threat from North Korea, and implicitly China, in mind, while further deepening cooperation with the United States, according to a Japanese government official who was listening in.