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President Donald Trump made a shocking joke that left people in the Oval Office visibly uncomfortable on Thursday during a meeting with Japanese Prime Minister Sanae Takaichi.

A reporter asked Trump why he didn't tell U.S. allies, including European and Asian countries, such as Japan, that he was planning joint military strikes with Israel on Iran.

Trump's response shocked the room — and left some people nervously laughing.

"One thing, you don't want to signal too much when we go in," Trump said. "We went in very hard and we didn't tell anyone about it because we wanted surprise. Who knows better about surprise than Japan? Why didn't you tell me about Pearl Harbor?"