Union and industry groups say they have yet to see a draft of the new rule. Among the most pressing questions is when employers would have to comply, with Republicans warning that mandates ahead of the holidays might exacerbate the nation's worker shortage.
It's also unclear how long the temporary standard would be in place and if it would apply to short-term "gig" workers, like freelancers and Uber drivers, or smaller franchises that are part of nationwide chains, like small restaurants or gyms.
How employers will be expected to enforce the standard is another question mark.