Trump has claimed a few times that, in order for cars to be approved for import in Japan, they must be able to withstand an impact from a bowling ball without denting. It's not a real thing. When the White House press secretary was asked why Trump made up such a weird lie, she said it was "obviously a joke".
Reminds me of the mind-blowing video from Channel 5 news of them interviewing Trump supporters about him posting a pic of himself as king and they say "Oh it means he's the King of Presidents, like Elvis Presley is the King of rock and roll" and I just couldn't possibly facepalm any harder.
Its ironic to be complaining (or rather bullshitting) about japan restricting vehicle imports while the US is restricting imports of kei trucks for reasons.