Donald Trump assured American voters Thursday night that despite what Marco Rubio had suggested, there was "no problem" with the size of his hands -- or anything else.

"Look at those hands, are they small hands?" the front-runner for the GOP presidential nomination said, raising them for viewers to see. "And, he referred to my hands -- 'if they're small, something else must be small.' I guarantee you there's no problem. I guarantee."

Rubio in recent days revived a decades-old old insult, mocking Trump for having relatively slight hands.

"He's always calling me Little Marco. And I'll admit he's taller than me. He's like 6'2, which is why I don't understand why his hands are the size of someone who is 5'2," Rubio said in Virginia on Sunday. "And you know what they say about men with small hands? You can't trust them."

The New York billionaire has heard similar comments about his hands or, more precisely, his fingers, for years.

As Vanity Fair's Graydon Carter recalled online last year: "Just to drive him a little bit crazy, I took to referring to him as a 'short-fingered vulgarian' in the pages of Spy magazine. That was more than a quarter of a century ago."