Fight Against ISIS: 'We're Not Done,' Says Gen. John Allen

The top U.S. envoy in the fight against ISIS says it isn't over yet.

Yet Allen did not express any interest in targeting Assad’s military, a move that would be a dramatic shift in policy.

"No matter what we do militarily, Syria has got to be solved at a political level," Allen said.

"I think we should watch it. We should be conscious of the potential that Daesh may attempt to embed agents within that population," Allen said, using another common name for the terror group.

"I have confidence that they'll work very, very hard to prevent them from getting into the country," Allen said.