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At tonight's GOP debate in Houston, Marco Rubio accused Donald Trump of using illegal labor on past building projects and suggested he'd do the same for his proposed wall on the Mexican border.

"If he builds the wall the way he built Trump Towers he'll be using illegal immigrant labor to do it," Rubio said.

"So cute. Such a cute soundbite," Trump responded.

"That's not a soundbite, it's a fact," Rubio said. "Go online and Google it: 'Donald Trump polish workers.' You'll see it."

Rubio also attacked Trump for making clothes in China, to which Trump responded, "Well, you don't know a thing about business, you lose on everything."

Watch the clip above.

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