Expanded Food Safety Investigation Act of 2019 This bill provides that the Food and Drug Administration (FDA) may, under specified circumstances, request access to a concentrated animal-feeding operation (i.e., a stabled or confined animal-feeding operation) to conduct microbial sampling. Specifically, the bill allows the FDA to request access if the FDA determines that sampling is necessary to facilitate an investigation of a foodborne-illness outbreak, determine the cause of the outbreak, or address other public health needs. The bill provides that such an operation shall be subject to penalties for refusing such a sampling.