November 5, 2015 12:35 PM EST

Democratic presidential candidate Bernie Sanders took a shot at front-runner Hillary Clinton over her emails.

In an interview with the Wall Street Journal, the Vermont Senator argued that asking whether her use of a private email server as Secretary of State prevented public-records requests or compromised classified information are “valid questions.”

That seems to contradict Sanders’ statement during the Democratic debate that voters were “sick and tired” of hearing about Clinton’s “damn emails,” a remark that drew loud applause from the audience.

Read Next: Bernie Sanders Defends Hillary Clinton on Email Controversy at Debate

But Sanders told the Journal that he had not changed his opinion since the debate.

“You get 12 seconds to say these things,” said Sanders. “There’s an investigation going on right now. I did not say, ‘End the investigation.’ That’s silly…Let the investigation proceed unimpeded.”

In September, Sanders told TIME that he dislikes negative campaigning and would instead focus on his substantive differences with Clinton’s policy positions on topics such as Wall Street, the minimum wage and the free trade agreements.

Read Next: Bernie Sanders Brushes Off Clinton Super PAC Attacks

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