Democratic presidential candidate Bernie Sanders told Fox News host Chris Wallace that he was skeptical about attending a debate hosted by the conservative network because of the way that it had unfairly treated Democrats in the past.

During an appearance on Fox News Sunday, Wallace noted that the Democratic National Committee had refused to sanction a debate on Fox News.

"I hope you feel that you haven't been mistreated," the Fox News host said. "Would you be willing to participate in a Democratic debate on Fox News?"

"If we were clear to understand what the guidelines were, what the rules were and to make sure that they were fair and the DNC was in favor of it, I would have no objections," Sanders explained.

"You've seen this interview we just did," Wallace replied, insisting that Fox could be fair.

"Chris, I have seen this interview," Sanders interrupted. "But I have also seen other interviews. So, if I could have a guarantee and knew who the questioners were and the framework for the debate was fair, I would have no objection."

"I'll take that as a definite maybe," Wallace concluded.