A debate Wednesday morning between Republican Senate hopefuls Ken Buck and Jane Norton got heated after a Buck donor shouted down Norton from his spot in the audience. 

It happened after Norton brought up a reprimand Buck received during his time in the U.S. Attorney’s office a decade ago. Norton has used it to question Buck’s ethics.

The details from the Denver Post’s Allison Sherry:

The rebuke came after Buck trash talked a case against an Aurora gundealer to defense attorneys before his then-boss U.S. Attorney Tom Strickland filed felony charges for illegally selling cheap guns. Norton has run negative radio ads questioning Buck’s judgement after a Denver Post story outlined what happened.

A woman in the audience asked Norton how could she support Buck, should she lose the primary, if “he’s as bad as your radio ads say he is?”

“Ethics and integrity matter,” Norton said. “Because of Ken’s reckless disregard … that is what the reprimand said … he said it compromised the case. We need to have a discussion about the issue.”

The gundealer, Greg Golyansky, pleaded guilty to a misdemeanor and can no longer sell guns. He is a Buck campaign contributor.

Golyansky, sitting at a front table, jumped out of his seat. “Bull—-! That was a case against me and you’re lying!”

Buck told Golyansky to sit down.

“Sir, you are no longer allowed to sell guns in America,” Norton said.

Golyansky sat down, but continued yelling, “Because of liars like you!”

Buck and Norton are locked in an increasingly nasty primary battle for the Republican nomination for Sen. Michael Bennet’s (D) seat. The primary is Aug. 10.