Donald Trump told Neil Cavuto today that the ongoing success of his presidential campaign is a "great tribute to business."

He said he's only spent "a couple million dollars" since launching his White House bid in mid-June, including zero on advertising.

Trump said that's because the networks cover him so extensively.

The GOP front-runner added that he's not controlled by big donors, unlike most of the other presidential candidates, which voters notice and appreciate.

"It's sort of a great tribute to business," Trump said. "I've spent the least money and I have the best poll numbers."

He revealed, however, that he doesn't mind spending more money as the race goes on.

Watch more above.

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