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The US presidential debates are finally getting to the core of important issues. On Thursday night at the Fox News Republican Presidential debate, Donald Trump told everyone that he guarantees there's no problem with his manly appendage, as can be seen in the video above.

Responding to Marco Rubio's earlier critique of the size of Trump's hands, Trump said, " He hit my hands. Nobody has ever hit my hands. I have never heard of this... look at those hands. Are they small hands?" he asked the crowd.

"And he referred to my hands, if they are small, something else must be small. I guarantee you there's no problem," he finished.

It started with a question by Fox News' Bret Baier to Marco Rubio about his personal attacks on Donald Trump over the last few days, defending which Rubio said it was in response to Trump's very personal attacks against all candidates, and that he was all for moving on to the real issues.

Responding to which, Trump brought up the size of his hands and his manhood.

Trump has been attacked on his hands before, though, as John Oliver pointed in his episode on Trump on Last Week Tonight. Questioning Trump's alleged toughness when he could be so sensitive about the size of his fingers, Oliver said, "Back in 1988 Spy magazine called him a 'short-fingered vulgarian' and ever since the editor Graydon Carter says he receives envelopes from Trump, always with a photo on which he has circled his hand, to highlight the length of his fingers, usually with a note reading 'See, not so short!'"