The APWU released a statement this week saying that although it intends to encourage postal workers to get the vaccine, it is "not the role of the federal government to mandate vaccinations for the employees we represent."
The statement goes on to say that any issues related to COVID-19 testing and vaccines in the workplace need to be negotiated with the union, which represents more than 220,000 postal workers.
They added: "At this time, the APWU opposes the mandating of COVID-19 vaccinations in relation to U.S. postal workers."
The statement comes just a day after Biden announced that the White House was mulling a COVID-19 vaccine mandate for all federal workers. On a trip to McLean, Virginia, he admitted that it was under consideration and blamed unvaccinated people for the pandemic.