Donald Trump, Jr. told Greta Van Susteren tonight that his advice for his father for tomorrow's Fox Business Network-Wall Street Journal Republican debate is "be yourself."

He explained that his father is a businessman and will be the only one on the debate stage who has actually created thousands of jobs.

"If this is about the economy, it seems like a no-brainer," Trump, Jr. said, noting that the polls show that voters trust his father on the economy more than any other candidate by a wide margin.

Despite those numbers, Trump, Jr. said that his father still doesn't get enough credit for being the great businessman that he is and creating what he's created.

He said that his dad is a patriot who's stepping back from his incredibly successful business endeavors to help the country.

"He's fed up. He's seen too much of this waste and inefficiency go on for too long. So it's really great to see him so passionate about it."

Watch more above and be sure to tune in to the Fox Business Network-Wall Street Journal Republican debates on Tuesday night. The first forum begins at 7p ET and the primetime debate follows at 9p ET.

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