Donald Trump left the room stunned after making a Pearl Harbor joke during an Oval Office meeting, with Japan’s Prime Minister sitting right there.

The moment unfolded as Trump welcomed Japanese Prime Minister Sanar Takaichi to the White House, during a discussion that quickly turned to the recent bombing of Iran as part of Operation Epic Fury.

Trump didn’t hold back. When asked why the US hadn’t informed its allies ahead of the strike, Trump initially kept it straightforward, saying the country “went in very hard” and “didn’t tell anybody because [they] wanted surprise.”

But then, he veered off script, according to VT.

“Who knows better about surprise than Japan?” he said.

The comment was met with uneasy laughter, before Trump doubled down, adding: “Why didn’t you tell me about Pearl Harbor, OK?”

“We probably knocked out 50 percent”

The reaction was immediate. Audible groans spread across the room before everything fell into an uncomfortable silence.Takaichi’s expression visibly changed, her reaction making it clear the remark hadn’t landed as intended, according to VT.

Trump quickly moved on, returning to his original point about the operation.

“He’s asking me about surprise, and we did,” he said.

“And because of that surprise, we knocked out … we probably knocked out 50 percent … and much more than we anticipated doing.

“So if I go and tell everybody about it, there’s no longer a surprise.”

The reference, however, pointed to one of the darkest chapters in US-Japan relations.

The 1941 attack on Pearl Harbor killed more than 2,400 US service members and left around 1,200 others injured. Four American battleships were sunk, and it remained the deadliest attack on US soil until 9/11 in 2001.