Who has the legal standing to challenge these OSHA mandates?
As I see it, the EMPLOYERS may be the only ones who have the legal standing to challenge the OSHA mandates. That should be fine, except that I suspect most employers have no interest in challenging them.
Think about it ...
Over the last eight months, employers have been dealing with a completely untenable situation where they can't figure out what kind of COVID-related work place requirements they should impose. If they require vaccines, then they may be potentially liable for vaccinated employees who suffer from vaccine side effects. If they don't require vaccines, then they may be liable for employees who contract COVID on the job.
Biden has done these employers a huge favor by eliminating their legal exposure when they impose vaccine mandates.
“Who has the legal standing to challenge these OSHA mandates?”
IMO, everyone.
OSHA has no constitutional authority to write laws, mandates, dictates or rules. Only congress has legislative authority. And no, Congress may not transfer its law-making duty to unelected bureaucrats. Period.