Everyone’s favorite just-this-side-of-legal drug kingpin Martin Shkreli is very upset with Bernie Sanders after the presidential candidate declined a $2,700 donation Shkreli made in September and gave it to a Washington health clinic instead.

Last month, Shkreli jacked up prices 4,000 percent on daraprim, the only available treatment for toxoplasmosis, a parasitic affliction. The next day, Sanders, in his capacity as the ranking member of the Senate Committee on Health, Education, Labor, and Pensions, sent Shkreli a letter informing him that his company and the sudden price increase were under investigation and requesting that certain documents and information be turned over by October 9th.

On September 28, Shkreli donated $2,700 (the maximum individual contribution) to the Sanders campaign. He donated the money, he told Stat News, as much to get the senator’s attention as because he supports his policies.

“I’d ask him, what role does innovation play in health care?” Shkreli said. “Is he willing to sort of accept that there is a tradeoff, that to take risks for innovation, companies have to invest lots of money and they need some kind of return for that, and what does he think that should look like?”

“I think it’s cheap to use one person’s action as a platform without kind of talking to that person,” Shkreli told Stat. “He’ll take my money, but he won’t engage with me for five minutes to understand this issue better.”

On Thursday, the Sanders campaign announced that it would be making a donation in the same amount to Washington’s Whitman-Walker health clinic. “We are not keeping the money from this poster boy for drug company greed,” campaign spokesman Michael Briggs said.

Meanwhile, the deadline, last Friday, for responding to the senator’s letter came and went without a response, Business Insider reported. As of Wednesday, according to CNBC, the drug’s price remained well above $700 per pill.

Photo credit: Getty Images. Contact the author of this post: brendan.oconnor@gawker.com.