U.S., allies keep up attacks on ISIS over weekend

WASHINGTON -- The U.S. and its allies kept up the attack on ISIS this weekend. President Barack Obama acknowledged the administration, in particular the intelligence community, underestimated the situation in Syria and the abilities of the Iraqi army.

Overnight, the airstrikes in Syria continued.

The U.S. military and its Arab partners are settling into a regular rhythm of almost daily assaults in what could be a very long campaign.

"Syria, it's a long time," said Captain Dan Cheever, commander of Carrier Air Wing 8. "It's going to take a long time and I don't know how long. I don't know if there's a breaking point, but I think we are going to be in this for a while."

ABC News' Terry Moran is on the Turkey-Syria border were a new front has opened up.

"All day long these people have been bearing witness to a battle in defense of their town," Moran said. "This is the border right here, Kurdish fighters on the opposite hill, trying to hold off ISIS fighters surging forward.

In an interview with CBS' 60 Minutes, Obama said the U.S. got it wrong on two major issues.

"I think our head of the intelligence community, Jim Clapper, has acknowledged that I think they underestimated what had been taking place in Syria," he said.

"He didn't just say that we underestimated ISIL, he said we overestimated the ability and the will of our allies, the Iraqi army, to fight," said 60 Minutes' Steve Kroft.

"That's true. That's absolutely true," said Obama.

House Speaker John Boehner told ABC's George Stephanopoulos that airstrikes alone won't defeat ISIS.

"At some point, somebody's boots have to be on the ground," he said.

And if nobody steps up, Boehner says it will have to be the U.S.

"We have no choice," he said. "These are barbarians, they intend to kill us."

But the White House insists there will be no American ground invasion in Iraq or Syria.