100 The opinion of the Attorney General in relation to the power of the Commonwealth to regulate the issue of passports, was concerned with the question, that arose during World War 1, as to whether, after the War, the States may resume the issue of passports. The Attorney General, William Morris Hughes, was of the opinion that a passport is in substance "a document, issued by government for identifying a citizen and authenticating his right to protection when in a foreign country". More relevantly, he was of the opinion that the issue of passports clearly came within the scope of "external affairs" and that the Commonwealth Parliament should legislate to regulate the issue of passports to overcome the "undesirable" situation of the States issuing passports. Of course, the Commonwealth of Australia's interest in regulating the possession and usage of falsified or fabricated passports issued by other countries, within the Commonwealth of Australia, could not be in doubt. The Commonwealth, at least, has an interest in it's relationship with countries, nations and territories outside of Australia, in ensuring that such documents are prevented from future use, or circulation, outside of the "issuing" country, when that issue arises from conduct within Australia.