Story highlights Senator Bernie Sanders is tired of people questioning his credentials on international affairs

The Vermont senator says he's been "lectured on foreign policy" recently

Portsmouth, New Hampshire (CNN) Vermont independent Sen. Bernie Sanders is tired of people questioning his credentials on international affairs, saying that he's been "lectured on foreign policy" recently.

"As somebody who voted against the war in Iraq, who lead the opposition for the war in Iraq, lately I have been lectured on foreign policy," he told a group of mostly students on Sunday at Great Bay Community College here. "The most important foreign policy issue in the modern history of this country was the war in Iraq. I was right on that issue, Hillary Clinton was wrong."

Sanders was likely referring to a question in Thursday night's Democratic debate, when Clinton, a former secretary of state, questioned the depth of his foreign policy agenda.

"A vote in 2002 is not a plan to defeat ISIS," she declared firmly on the stage.

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