Japanese Prime Minister Shinzo Abe told U.S. President Donald Trump that the strengthening of their two nations’ alliance would be maintained even after Abe’s departure from office, a Japanese government spokesman said on Monday.

Abe announced on Friday he was resigning because of poor health, his long-running battle with ulcerative colitis ending his tenure as Japan’s longest-serving prime minister.

ā€œHe wants President Trump to rest assured because the policy of bolstering the Japan-U.S. alliance will remain unchanged,ā€ Deputy Chief Cabinet Secretary Akihiro Nishimura said.

Nishimura was speaking to reporters after a 30-minute telephone call between Abe and Trump, early on Monday in Japan. Trump called Abe the ā€œgreatest prime minister in Japan’s historyā€, according to a White House spokesman.

Abe told Trump that Japan would like to cooperate closely with the United States as it draws up a new missile defence strategy, Nishimura said.

Japan in July took a step towards acquiring weapons that can strike North Korea, after a ruling party committee approved proposals to consider acquiring strike capability to halt ballistic missile attacks.

White House spokesman Judd Deere said in a statement Trump told Abe he had done a ā€œfantastic jobā€ and that the relationship between their two countries was stronger than it has ever been.

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ā€œThe president called Prime Minister Abe the greatest prime minister in Japan’s history,ā€ Deere said.

The ruling Liberal Democratic Party will vote on Sept. 14 for a new leader to succeed Abe, Jiji news agency reported.

(Reporting by Kiyoshi Takenaka, Daniel Leussink, David Dolan and Jeff Mason; Editing by Chang-Ran Kim, Robert Birsel)