Bernie Sanders is tired of talking about former President Bill Clinton.

The Vermont senator took a stand against any further questions about the former president's sexual history, when NBC debate moderator Andrea Mitchell posed a question about Sanders' previous comments calling Clinton's past transgressions "totally, totally, totally disgraceful and unacceptable."

"That question annoys me," Sanders said on the debate stage Sunday. "I cannot walk down the street - Secretary Clinton knows this -- without being told how much I have to attack Secretary Clinton."

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The Vermont senator said he has tried instead to "run an issues-oriented campaign."

"I was asked a question" on Bill Clinton, Sanders said of his previous comments. But -- unlike Donald Trump, who has had no qualms in targeting Clinton's sexual history -- he did not want to engage any further on the issue.

Sanders did, however, condemn the former chief executive's past behavior.

"Yes, his behavior was deplorable," he said. "Have I ever once said a word about that issue? No, I have not. I am going to debate Secretary Clinton and Governor O'Malley on the issues facing the American people -- not Bill Clinton's personal behavior."

Clinton has said in the past that she would consider her husband in an advisory role if she were elected to the White House.

Asked Sunday what sort of position she envisioned for her spouse, the former secretary said: "When it comes to the economy and what was accomplished under my husband's leadership in the 90's, especially when it came to raising income for everybody... you bet I'm going to ask for his ideas. I'm going to ask for his advice."