Sen. Claire McCaskillClaire Conner McCaskillTrump nominees meet fiercest opposition from Warren, Sanders, Gillibrand Feds allow campaigns to accept discounted cybersecurity services GOP frets over nightmare scenario for Senate primaries MORE (D-Mo.) expressed dismay at the behavior of her town hall audience today, stopping at one point to criticize what she called "rudeness."

"I don't understand this rudeness," she said when an attendee interrupted her. "What is this? I don't get it. I honestly don't get it. Do you all think that you're persuading people when you shout out like that?"

"I beg your pardon? You don't trust me?" McCaskill asked when the attendee responded. The crowd erupted with a loud "No!"

"I don't know what else I can do," McCaskill said.

Here's video of the exchange, captured by Talking Points Memo: