Former Defense Secretary Leon Panetta was harshly critical of President Obama's handling of the new ISIS war, saying the US could have sustained the 2011 Iraq occupation and started arming Syrian rebels even sooner than they did.

But perhaps the most eye-opening comment in has new book tour was that he believes the conflict is a "30-year war" that will extend across the world, including campaigns in Nigeria, Somalia, and Libya, among other places.

Panetta's new book, entitled Worthy Fights, argues that the Obama Administration repeatedly erred by not taking more hawkish positions, including says the US should've invaded Syria outright in 2013 instead of making the deal for Syria to scrap its chemical weapons.