While the largest federal union, the American Federation of Government Employees (AFGE), has “strongly encouraged” vaccinations for its members, it doesn’t want Biden’s executive order mandate to override collective bargaining prerogatives.

That order and another one on federal contractors override the previous White House position that employees and contractors must “attest to being fully vaccinated.” If they didn’t, they would face weekly or twice weekly coronavirus testing and restrictions on work related travel, in addition to masking and physical distancing requirements.

Union leaders generally don’t oppose the mandate, but “changes like this should be negotiated with our bargaining units where appropriate,” said AFGE President Everett Kelley. “Put simply, workers deserve a voice in their working conditions.”