The first contention
52 The applicant's first contention can be summarised as follows: by virtue of having been accepted by the Australian body politic and community as a citizen, the applicant is not an alien; the fact that he renounced that citizenship in 1995 does not change his non-alien status; as a non-alien, he is not subject to the provisions of the Migration Act; it follows that his detention under s 189(1) of the Migration Act is unlawful.
53 The applicant submits that, while a person who is currently a citizen is not an alien, alienage and citizenship are not "co-terminous": Love v Commonwealth (2020) 270 CLR 152 (Love) at [466] per Edelman J and at [304]-[305] per Gordon J; Re Minister for Immigration and Multicultural Affairs; Ex parte Te (2002) 212 CLR 162 (Ex parte Te) at [53] per Gaudron J; Shaw v Minister for Immigration and Multicultural Affairs (2003) 218 CLR 28 (Shaw) at [79] per Kirby J.
54 The applicant relies heavily on the following passage in the judgment of Gleeson CJ, Gummow and Hayne JJ (with whom Heydon J agreed) in Shaw. Gleeson CJ, Gummow and Hayne JJ said at [32]:
This case should be taken as determining that the aliens power has reached all those persons who entered this country after the commencement of the Citizenship Act on 26 January 1949 and who were born out of Australia of parents who were not Australian citizens and who had not been naturalised.
(Emphasis added.)
55 The applicant notes that the above passage from Shaw was approved in Chetcuti v Commonwealth (2021) 392 ALR 371 (Chetcuti) at [15] per Kiefel CJ, Gageler, Keane and Gleeson JJ. The applicant's submission is that, in circumstances where he was naturalised, he is not an alien within the above description of an alien. In oral submissions, counsel for the applicant submitted that what was said in Shaw at [32], and then endorsed in Chetcuti at [15], "exhaustively qualifies" who is an alien and the obverse, that is, who is not an alien (T70).
56 The applicant submits that his renunciation of his Australian citizenship does not alter the fact of his naturalisation, nor does it alter his constitutional status as a non-alien. The applicant refers to the following passage from the judgment of Toohey J in Cunliffe v Commonwealth (1994) 182 CLR 272 at 374-375:
In Nolan v Minister for Immigration and Ethnic Affairs the Court held that an alien can generally be defined as a person born out of Australia of parents who were not Australian citizens and who has not been naturalized under Australian law or a person who has ceased to be a citizen by an act or process of denaturalization.
(Footnote omitted; emphasis added.)
57 This passage reflects the judgment of Mason CJ, Wilson, Brennan, Deane, Dawson and Toohey JJ in Nolan v Minister of State for Immigration and Ethnic Affairs (1988) 165 CLR 178 (Nolan) at 183, where their Honours said:
As a matter of etymology, "alien", from the Latin alienus through old French, means belonging to another person or place. Used as a descriptive word to describe a person's lack of relationship with a country, the word means, as a matter of ordinary language, "nothing more than a citizen or subject of a foreign state": Milne v Huber. Thus, an "alien" has been said to be, for the purposes of United States law, "one born out of the United States, who has not since been naturalized under the constitution and laws". That definition should be expanded to include a person who has ceased to be a citizen by an act or process of denaturalization and restricted to exclude a person who, while born abroad, is a citizen by reason of parentage. Otherwise, it constitutes an acceptable general definition of the word "alien" when that word is used with respect to an independent country with its own distinct citizenship.
(Footnotes omitted; emphasis added.)
58 The applicant submits that even applying these descriptions, the applicant is not an alien, because he ceased to be an Australian citizen by renunciation rather than denaturalisation. The applicant submits that denaturalisation is an act or process by which the body politic rejects or revokes membership by way of citizenship. The applicant submits that denaturalisation is not the same as, but is a subset of, the more general concept of cessation of citizenship. It is submitted that the applicant has been the subject of no such process - he is, rather, a voluntary renouncer. The applicant submits that: the distinction between these two processes has been made clear by Parliament; renunciation is the only means of ceasing citizenship without initiation by the Minister (i.e. on behalf of the body politic or Australian community); denaturalisation occurs in response to unusual, prescribed crimes, including terrorism; those who are denaturalised cannot apply to resume their Australian citizenship; those who renounced their citizenship may, at any time, apply to 'resume' it.
59 The applicant submits that: the plainest indication that the applicant has been accepted (and never rejected) as a member of the Australian community which constitutes the body politic is the grant of citizenship to him, coupled with his loss of citizenship status arising from his voluntary renunciation of his citizenship; at the time of renunciation, no assessment of him was made by the Australian polity that he was unfit to be a citizen, or that he was no longer a "belonger" to the political community: see Love at [394], [437]-[438] per Edelman J; see also at [32]-[33] per Kiefel CJ.
60 In my view, the applicant's first contention should be rejected.
61 First, insofar as the applicant relies on the passage from Shaw at [32], I do not accept the proposition that that is an exhaustive statement of who is an alien and who is not. The High Court in that case was not considering the position of a person, such as the applicant, who became an Australian citizen by conferral and who subsequently renounced their citizenship. Thus, in describing an alien as a person who (among other things) "had not been naturalised", their Honours were not saying that a person who had been naturalised will always be (no matter what the facts) a non-alien. Their Honours were not addressing the situation of a person who had been naturalised but later ceased to be a citizen.
62 Secondly, insofar as the applicant submits that he is outside the description of an "alien" in Nolan at 183, I am not persuaded by that submission. In my view, in referring to "an act or process of denaturalization", the joint judgment in Nolan was using that expression broadly and in a way that encompassed various different ways by which a person may cease to be a citizen. I am not persuaded that there is a relevant distinction between, on the one hand, ceasing to be a citizen by renunciation pursuant to s 18 of the Australian Citizenship Act 1948 and, on the other hand, ceasing to be a citizen by deprivation of citizenship under s 21 of that Act. Both provisions fall within Div 4 of Pt III, dealing with loss of citizenship. Section 18 required an act by the Minister, namely registration of the declaration; thus renunciation under this provision was not able to be effected by a unilateral act by the applicant. This is demonstrated by the documents in evidence relating to the renunciation of the applicant's citizenship, which include a registration document: see annexure "ER-1" to Mr Rogers's affidavit.
63 Thirdly, apart from Aboriginal Australians and possibly Torres Strait Islanders (see Love) and exceptional cases (see Pochi v Macphee (1982) 151 CLR 101 at 109 per Gibbs CJ), it is open to Parliament to determine who is, and who is not, to be treated an "alien", and Parliament has determined that all non-citizens are to be treated as aliens. This position was recently affirmed by a majority of the High Court in Chetcuti. In that case, Kiefel CJ, Gageler, Keane and Gleeson JJ stated at [11]-[12]:
11 Since 2 April 1984, the Commonwealth Parliament has relied on the legislative power with respect to aliens to sustain the Migration Act. Subject to providing through s 15A of the Acts Interpretation Act 1901 (Cth) for the Migration Act to have a distributive and severable operation to the extent of any constitutional overreach, the Parliament has done so treating all non-citizens as aliens. And since 1 September 1994, it has done so creating a clear-cut distinction between lawful non-citizens, being non-citizens who hold visas permitting them to enter and remain in Australia, and unlawful non-citizens, being non-citizens who do not hold visas and who are in consequence liable to detention and to removal from Australia.
12 In challenging his detention on the ground that he is not within the reach of the aliens power, the appellant does not seek to disturb the settled understanding that the aliens power encompasses both power to determine who is and who is not to have the legal status of an alien and power to attach consequences to that status. Nor does the appellant seek to disturb the settled understanding that, in determining who is and who is not to have the legal status of an alien, it is in general open to the Parliament to "treat as an alien any person who was born outside Australia, whose parents were not Australians, and who has not been naturalized as an Australian".
(Footnotes omitted; emphasis added.)
See also at [14]-[16] per Kiefel CJ, Gageler, Keane and Gleeson JJ; cf at [37]-[38] per Gordon J, at [60], [65] per Edelman J, at [105] per Steward J. See also Ex parte Te at [21]-[26] per Gleeson CJ, at [209]-[210] per Hayne J; Shaw at [2] per Gleeson CJ, Gummow and Hayne JJ (Heydon J agreeing).
64 In the present case, although the applicant was naturalised as an Australian, he subsequently renounced his citizenship and ceased to hold Australian citizenship. As set out in Chetcuti at [11], the Parliament has determined to "treat[] all non-citizens as aliens". The applicant is a non-citizen. He is, therefore, at least prima facie, an alien.
65 Fourthly, it is not suggested that the applicant is an Aboriginal Australian or Torres Strait Islander, and (subject to consideration of the applicant's second contention) there is nothing about the applicant's case to suggest that he is within the exceptional class of case referred to by Gibbs CJ in Pochi v Macphee at 109.
66 For these reasons, I reject the applicant's first contention.