The Fraternal Order of Police wants the online retailer to follow Walmart and remove a shirt that sports the words "Bulletproof: Black Lives Matter" across the chest, The Guardian reported Friday. Walmart removed the shirt from its store after the union called it "offensive."

FOP President Chuck Canterbury wrote in a letter to Amazon CEO Jeff Bezos to support the union in "increasing the bonds of trust between the men and women of law enforcement and the communities they serve."

As of Monday morning, the shirt was listed on the Amazon website, but was "currently unavailable."

Canterbury told The Guardian that he wasn't surprised that Amazon wouldn't remove the listing and called the website a "pretty liberal marketer."

He added that the issue was still important because of the "amount of violence demonstrated at Black Lives Matter marches and the fact that eight police officers had been assassinated while protecting Black Lives Matter protests," – referring to the police killings in Dallas and Baton Rouge over the summer.