President Donald Trump reportedly told Japanese prime minister Shinzo Abe "I remember Pearl Harbor" during a meeting at the White House in June, the Washington Post reported on Tuesday.
The reported comment is part of an increasingly complicated relationship between the two world leaders.
Trump imposed steel and aluminum tariffs on Japan, and Abe hasn't retaliated.
President Donald Trump reportedly caught Japanese prime minister Shinzo Abe off guard with a comment about Pearl Harbor during a meeting at the White House in June, according to the Washington Post.
Trump reportedly said "I remember Pearl Harbor" to Abe in what was described as a "tense" meeting, referring to the attack by Japan on the United States that led to the US entering World War II.
Multiple diplomats spoke to the Post anonymously to describe the president's increasingly fraught relationship with Abe, as Trump's tariffs on steel and aluminum hit Japan's economy and his policies on North Korea differ from Abe's desired approach.
Trump reportedly ignored advice from Abe on negotiating with North Korea before meeting with Kim Jong Un in Singapore this past June, according to the report.
A diplomat could not explain the meaning of Trump's comment about Pearl Harbor, but told the Post Trump appreciates historical references and mentions Japan's "samurai past".
Trump and Abe have had a largely positive relationship, often bonding on the golf course. Abe has even stayed at Trump's private Mar-a-Lago club in Palm Beach, Florida during one of their many meetings.
The two have met eight times since Trump took office, which is more than any other world leader. And they've spoken on the phone 26 times, according to the Post.
Calling him his "good friend", Trump sees Abe as a respected counterpart and a good negotiator, according to the report.
Meanwhile, Abe has lauded Trump's leadership as "outstanding" and "remarkable", and has not retaliated against Trump's tariffs. Abe even gave Trump a gold-plated golf club worth $3,800, according to the Post.
Despite the recent strain in the US-Japan relationship, both countries say that the partnership remains strong and that Abe's relationship with Trump is better than it was with President Barack Obama.