U.S. Senator Bernie Sanders on Tuesday called for President Joe Biden to issue an executive order to cut off federal contracts to Amazon.com Inc until the e-commerce company stops what he described as "illegal anti-union activity."

"As you may know, Amazon, one of the largest and most profitable corporations in America, is the poster child as to why this anti-union busting Executive Order is needed now more than ever," Sanders said in a letter to Biden, which was reported earlier by Politico.

Workers at an Amazon warehouse in New York City recently voted to form the first union at the second-largest U.S. private employer. Amazon objected and accused the union of threatening workers unless they voted to organize, an allegation denied by the labor group.

Amazon workers from more than 100 other U.S. work sites have expressed interest in unionizing.

In his letter, Sanders also raised concerns over Amazon's classification of its drivers as independent contractors rather than employees, which provides them with a narrower set of benefits while preventing them from forming a union.

Amazon did not immediately respond to a request for comment late on Tuesday.

"Taxpayer dollars should not go to companies like Amazon and multi-billionaires like Jeff Bezos who repeatedly break the law," Sanders said in a speech https://bit.ly/3Ln2xjp on the Senate floor on Tuesday evening.

Biden has ousted government officials deemed by unions to be hostile to labor and reversed rules of former President Donald Trump that critics said weakened worker protections.

Sanders urged Biden to go further and cut-off federal contracts for firms seen as "union busters".

"Today I say to President Biden; you promised to prevent union busters like Amazon from receiving lucrative contracts from the federal government. Keep that promise," Sanders said on the Senate floor.

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Bernie Sanders
U.S. Senator Bernie Sanders (I-VT) speaks at an Amazon facility during an Amazon Labour Union (ALU) rally in Staten Island, New York City, U.S., April 24, 2022. Photo: Reuters / ANDREW KELLY