You really need to hire an employment lawyer to review the contractual terms and give you your options.
Providing general answers are meant to help the poster to understand some complex legal concepts and in no way creates an attorney-client relationship.
A breach of contract suit requires a contract. Was your husband a party to an executed employment contract? Or was he offered at will employment? If the latter, he could have been fired the first day he began work, a fact that he is held to know and a risk he assumed. Without a contract, it will be very difficult to make a case here.
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In order to have a viable breach of contract claim you need to first have a contract. The contract can be either oral, written, or a hybrid of both oral and written. Depending on what type of contract you have, if any, with the agency will determine your applicable statute of limitations. In order to properly address the issues presented by the question, an employment law attorney should be consulted.