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Marco Rubio and Donald Trump clashed once again at the Fox News GOP debate in Detroit. 

It started when Trump was asked about products made overseas by his companies and immediately called out Rubio for lying about him. 

Rubio accused Trump of never answering questions and choosing instead to attack others.

Trump argued that Rubio has never employed anyone, with the senator claiming that Trump has "ruined" companies that he's started. 

Trump then repeatedly called Rubio "little Marco," prompting Rubio to answer, "OK, big Don."

Watch the exchange above.

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