Sen. Bernie Sanders (I., Vt.) said Hillary Clinton's use of a private email server while secretary of state was not "good practice" in an interview with MSNBC's Andrea Mitchell on Monday.
"While you haven't criticized Hillary Clinton because of the email controversy, would you as president permit a cabinet secretary, someone in the national security cabinet, to use a private email system?" Mitchell asked.
"I think that's an issue that we've got to take a hard look at, and I think what's going on now is I think Secretary Clinton now realizes [it] is not a good practice," Sanders said, before adding, "Uh, so."
"Do you think she jeopardized national security?" Mitchell asked.
"Well, there is a process that is going on now," he said. "We will learn more about it. But this campaign that I am running, let me reiterate, is not against Hillary Clinton or anybody else."
Sanders has largely refrained from attacking Clinton during his surprising campaign, which has seen him rise to second place in the polls in Iowa and first place in New Hampshire. He did previously hit Clinton on Mitchell's program for not taking enough questions from the press and not taking a firm stance on the Trans-Pacific Partnership.