The presidential candidacy of businessman Donald Trump has been a rich vein of comedy gold for Last Week Tonight host John Oliver, who once again hammered the buffoonish billionaire on Sunday night — this time for his ignorance of all things nuclear.

Calling Trump “America’s potential next president,” the HBO host noted that Trump seemed ill-equipped to talk seriously about foreign policy and nuclear proliferation.

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In an interview with CNN’s Anderson Cooper last Tuesday, Trump glibly suggested that countries that live under the umbrella of American security should step up, protect themselves and be allowed to possess nuclear weapons.

“At some point we have to say, you know what, we’re better off if Japan protects itself against this maniac in North Korea,” Trump told Cooper. “We’re better off, frankly, if South Korea is going to start to protect itself.”

Asked about Saudi Arabia getting nukes, Trump replied: “Saudi Arabia? Absolutely.”

“He says that with the confidence of a man who could easily find Saudi Arabia on a map if he was given three tries — and the map only included countries ending with ‘Arabia,’” a smirking Oliver said.

Trump also stated that nukes could be used in Europe because: “Europe is a big place.”

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“It’s ‘a big place’ is not a good excuse for using nuclear weapons,” Oliver explained. “It’s barely a good excuse for peeing in the ocean.”

Oliver then turned to comments made by President Obama about Trump’s interview, with the president stating that Trump “doesn’t know much about foreign policy, or nuclear policy, or the Korean Peninsula, or the world generally.”

“President Obama is basically implying there that you could fill a book with the things Donald Trump doesn’t know,” Oliver translated. “That book being the encyclopedia.”

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Watch the video below via YouTube: