Donald Trump went on a deranged rant about magnets while completely misunderstanding how they work during an address to Navy troops in Japan.

Speaking aboard the USS George Washington aircraft carrier during his tour of East Asia, the president appeared to suggest—in an incoherent and rambling speech—that he is pushing for aircraft carriers to use “steam for the catapults” and hydraulics for elevators, while wrongly claiming that magnets don’t work when they get wet.

“You know, the new thing is magnets. So instead of using hydraulic that can be hit by lightning and it’s fine. You take a little glass of water, you drop it on magnets, I don’t know what’s going to happen,” Trump said.

“So, you know, the elevators come up in the new carriers—I think I’m going to change it, by the way—they h

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