refusing to violate corporate policy

What is the name of your state?AZ My husband works for a large national homebuilder. His supervisor demanded he violate company policy and provide a key or leave a house open for a homebuyer (who is not in possession of the property legally or otherwise). Employees are told they can be fired immediately if this particular violation occurs and homebuyers sign a contract that they are not entitled to a key or to be let onto the property unescorted by a co. rep. until the record of sale is recorded. My husband refused to violate the policy. His supervisor's boss then called him and told him to placate this particular customer because she was difficult. My husband said he would not do it without something in writing from his superiors. Does he have any legal remedy if they fire him? This is an act of insubordination but he feels it is dangerous and could potentially leave the company open to liability from the customer if agrees to give her open access to the property. He is an at will employee for a private corp. The action is not illegal it only violates the corp. policy and my husband is not a federal or state employee. Would this fall under a whistleblower category if he asks to speak to legal, human resources or upper management and he is fired? Thanks for any comments.

He can be fired if he keeps the key or gives it to the owner. Whether or not this rises to an unlawful termination would require a full review of all relevant circumstances.

As stated, I doubt seriously if such an occurance would rise to that level. It's a company policy, not a law he would be breaking.