In an extended exchange during Wednesday’s Democratic presidential debate about the financial industry’s influence in Washington, Bernie Sanders brought out that the head of Goldman Sachs had called the Vermont senator “dangerous.”

“He’s right. I am dangerous for Wall Street,” Sanders said.

The back-and-forth started when Hillary Clinton was asked about making public the speeches she delivered in front of the financial industry, for which she was paid hundreds of thousands of dollars.

Clinton argued her record shows she has taken on Wall Street, as well as other special interests. She also brought up an ad aired by a group affiliated with the billionaire Koch brothers in support of Sanders. The ad was about the Export-Import bank, which Sanders and the Kochs both oppose.

“There is nobody in the United States Congress who has taken on the Koch brothers — who want to destroy Social Security, Medicare, Medicaid and virtually every federal program passed since the 1930s — more than Bernie Sanders,” Sanders said.