WATCH: Rachel Maddow Confronts Hillary Clinton

When Democratic presidential candidate and former Secretary of State Hillary Clinton made a special appearance on last night's episode of Rachel Maddow's MSNBC show, Maddow asked Clinton about critical comments she made about an election ad put out by Democratic rival Bernie Sanders.

"We don't do that in our side of the debate. We engage on substantive differences," Clinton said, commenting on the rhetoric of Sanders's latest ad, in which he said there were "two Democratic visions" for regulating Wall Street.

"What I think people reacted to is that it was a very broad assertion that caught up all Democrats," Clinton continued.

"Senator Sanders is obviously your opponent," Maddow replied, after she pointed out that Clinton's camp called Sanders's ad "negative" and "an attack." "Nobody expects you guys to walk hand in hand and come to consensus on who ought to be the nominee. But he also doesn't have an enemy in the world in the Democratic Party."

"He's a very well-respected figure. Your campaign is essentially fighting with him now in a way that is casting aspersions on his character, calling him dishonest," she added.

Watch Clinton's entire one-on-one interview with Maddow in the video below.