Sen. Bernie Sanders hosts a Town Hall with workers from Amazon, American Airlines, Walmart, and other big companies. (Flickr Photo / Bernie Sanders)

Bernie Sanders is once again criticizing Amazon’s treatment of warehouse workers, a few months after celebrating the company’s decision to increase its minimum wage to $15 an hour.

The U.S. Senator from Vermont tweeted Monday, “Amazon must recognize that workers’ rights don’t stop at the minimum wage” in response to a Daily Beast report detailing 911 calls from inside the company’s warehouses.

“Amazon must significantly improve working conditions at its warehouses and respect the constitutional right of its employees to form a union and bargain collectively for a better life,” Sanders added.

The backdrop: Amazon raised its minimum wage for all employees to $15 an hour in October amid pressure from Sanders and other labor advocates. The move followed reports about brutal conditions inside Amazon’s fulfillment centers, which power its online retail business.

The big picture: Amazon’s wage hike offered temporary cover but the company still faces tough talk and scrutiny from Democrats, particularly those making a play for the presidency in 2020. Sanders will likely amp up pressure tech giants on the campaign trail, along with Elizabeth Warren. The Senator from Massachusetts released an ambitious proposal Friday to break up and regulate big tech companies, claiming they raise antitrust concerns.

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