Amid Nancy Pelosi's claims that 'it's not a spending problem', John Carlson talks to former US comptroller turned best-selling author, David M. Walker, about America's $16.5 trillion debt. Walker knows the US Treasury and budget inside and out. Hear his vital recommendations for what can be done to fix America's mountain of debt. Walker's best-selling 2010 book is "Comeback America". His website is KeepingAmericaGreat.org .