[Hoot Gibson]

This is a shocker. Trump lied about having a plan to wipe out the national debt in eight years because "it was a very hard fought primary campaign."

Newt Gingrich admitted earlier today that the Trump economic plan numbers do not add up because no candidate's numbers ever add up.

Trump adviser backs off plan to wipe out U.S. debt in 8 years

In April, Donald Trump told the Washington Post he could wipe out America's $19 trillion debt in 8 years.

On Sunday, an economic adviser for the Trump campaign acknowledged it's not doable.

"I think it would be hard to eliminate it," said David Malpass, speaking on CNN Sunday night. "I think we just have too much debt for it to go away in a short time period."

When asked about the change in position, Malpass responded: "That was a long time ago and it was a very hard-fought primary campaign."