Dave Clark is feeling the snark.

The Amazon exec on Wednesday tweeted about the ongoing unionization efforts at the company’s fulfillment center in Bessemer, Ala. Sen. Bernie Sanders was the subject of his tweets; the senator from Vermont will reportedly visit Bessemer on Friday to support workers who want to unionize.

Clark is one of Amazon’s top execs. He joined the company in 1999 and took over as Worldwide Consumer CEO this year after an 8-year stint as senior vice president of worldwide operations.

We’ve reached out to Amazon for additional comment and will update if we hear back. Update: Amazon said it had no further comment or statement beyond Clark’s tweets.

Just before the tweets about Sanders, Clark also tweeted at Sanders’ communication director in regard to the company’s decision to implement a $15 minimum wage.

More than 5,800 workers in Alabama are currently voting by mail on whether to organize under the Retail, Wholesale and Department Store Union. It’s a pivotal vote that could set the tone, if not a precedent, for hundreds of thousands of Amazon workers. Voting ends next week.

Sanders has been vocal about the unionization efforts in Alabama. Earlier this month he invited Amazon CEO Jeff Bezos to a Senate Budget Committee hearing on income inequality.

President Joe Biden earlier this month voiced support for workers without calling out Amazon by name. Sen. Marco Rubio took a more pointed route, writing an opinion piece in USA Today that said “woke CEOs” like Bezos view workers as a “cog in a machine.”

Rubio wrote: “Here’s my standard: When the conflict is between working Americans and a company whose leadership has decided to wage culture war against working-class values, the choice is easy — I support the workers. And that’s why I stand with those at Amazon’s Bessemer warehouse today.”

Amazon has fought back against efforts to unionize at its fulfillment centers, with The Washington Post reporting this month that the giant online retailer and cloud computing powerhouse is engaging in “hard-nosed” anti-union tactics it has honed over the past 27 years. Meanwhile, the company is rolling out a massive PR campaign, touting support for a national $15 per hour minimum wage.

Update: After Rep. Mark Pocan (D-WI) took issue with Clark’s tweet, Amazon’s news account fired back.

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