Europe is experiencing a refugee crisis, as hundreds of thousands of people continue to flee violence in the Middle East and rush across the European border to safety.

Former UN Ambassador John Bolton went "On The Record" and said that the crisis can be traced back to the failure of American leaders to destroy ISIS.

Bolton said that the refugee problem began when the Syrian Civil War broke out several years ago, and it has been exacerbated by the rise of ISIS.

He said that the stated goal has been to "degrade and destroy" the brutal terror group, but for the last year and a half, U.S. leaders have failed to achieve that objective.

"We've done nothing," Bolton stated. "Let's be clear, we have turned our eyes away from Syria and Iraq - or what used to be Syria and Iraq."

"We're doing nothing to stop ISIS achieve its objectives."

Watch more from "On The Record" above.