Obama's remark was in response to similar comments made by the Director of National Intelligence James Clapper, who told The Washington Post last week, "We underestimated ISIL [the Islamic State] and overestimated the fighting capability of the Iraqi army."

Obama had earlier hinted at intelligence shortcomings about ISIS during a press conference in August.

>> Read more trending stories

PRESIDENT OBAMA VIA THE WHITE HOUSE: "There is no doubt that their advance, their movement over the last several months has been more rapid than the intelligence estimates."

But Sunday's comments are some of the most candid remarks Obama's made about the rise of ISIS so far. The administration has been frequently criticized for initially underestimating the terror group's capabilities.

That's due in part to an offhand comment Obama made in January during an interview with The New Yorker, in which he referred to ISIS and other militant groups in the region as the "JV team," insisting they only posed a regional threat.

ISIS' scope has grown considerably since then, prompting the U.S. to assemble an international coalition aimed at dismantling the group. So far at least 18 countries have joined the U.S. and contributed to the fight against ISIS, which is being carried out primarily through airstrikes. (Video via The Telegraph)

In the "60 Minutes" interview, Obama also lays out a basic strategy for defeating ISIS without committing American troops to a protracted ground operation. The full interview airs Sunday night on CBS.

This video includes images from Getty Images.