141In those circumstances, it was sufficiently established that, first, to retain that opinion in the case file would harm the Council’s right to a fair hearing and its interest in receiving frank, objective and comprehensive advice, and, second, there was no overriding public interest capable of justifying the production by the appellant of the legal opinion at issue. Furthermore, to the extent that the appellant’s sole interest, however legitimate, of substantiating its argument with the support of that advice does not suffice to justify that harm to the rights and interests of the Council (see, to that effect, order of 14 May 2019, Hungary v Parliament, C‑650/18, not published, EU:C:2019:438, paragraphs 15 to 18, and judgment of 31 January 2020, Slovenia v Croatia, C‑457/18, EU:C:2020:65, paragraphs 70 and 71), all the more so given that the merits of that argument and therefore the possibility of its succeeding does not depend in any way on the production of that opinion, it must therefore be concluded that the balance of interests recalled in paragraph 131 of this judgment weighs in favour of the protection of the rights and interests of the Council.
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