Of course this person doesn't take questions, but I'd be asking them: "What, if anything, could OSHA order that you would deny is within their purview? If OSHA decided every employee must undergo a cavity check on the way into work to ensure workplace safety, would you go along?"

And to their point: Good. Congress has abdicated its responsibility too long, and the country has been left at the mercy of a merciless bureaucracy. Tell the executive they can't make arbitrary rules any more; they want something? get congress to do it