Kent Smetters calls Trump’s plan to grow out of $40 trillion in U.S. debt a “fantastic story” but “pretty clearly” not feasible.

Analysts warn that high spending, rising interest costs and tax cuts could impede Washington’s efforts to ‘grow our way out of’ record-high national debt.

"If you tell the debt markets: 'Hey, we think we're gonna be able to grow our way out of this,' and then a year later they're not seeing any improvements from that, then it's a…