Sen. Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE (I-Vt.) said Sunday that his Democratic presidential campaign is trying to put the scandal over campaign staffers accessing data belonging to front-runner Hillary ClintonHillary Diane Rodham ClintonFive takeaways from Cruz, O'Rourke's fiery first debate Heller embraces Trump in risky attempt to survive in November Live coverage: Cruz, O'Rourke clash in Texas debate MORE "behind us."

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He said that it is time to focus on "the real issues" such as income inequality and problems plaguing the middle class.

“We’re trying to work with the [Democratic National Committee] to put this whole thing behind us," he said on NBC's "Meet the Press."

"There were two breaches. We screwed up on one and the other one we did the right thing. Right now we're in negotiations with the DNC. Frankly, Andrea, I think for the American people there are far more important issues having to do with the disappearance of the American middle-class and huge income and wealth inequality and climate change and a corrupt campaign finance system. So I think on both sides we'd like to focus on the real issues."

In recent weeks, the Democratic establishment has been abuzz over the data breach, which took place on the system that manages data on voters around the country. Sander's campaign is suing the DNC over the issue.

Sanders rebuffed a question about whether the DNC is treating him fairly, pivoting to focus on the party's Republican opponents.

"Look, we have had our differences of opinion with the DNC, but at the end of the day the DNC, Hillary Clinton and myself, we want to defeat right-wing extremism in this country, so we're trying to work out our differences of opinion," he said.