65In this connection, first, in the light of the need to comply with Article 47 of the Charter, that procedure must ensure, to the greatest possible extent, that the adversarial principle is complied with, in order to enable the person concerned to contest the grounds on which the decision in question is based and to make submissions on the evidence relating to the decision and, therefore, to put forward an effective defence. In particular, the person concerned must be informed, in any event, of the essence of the grounds on which a decision refusing entry taken under Article 27 of Directive 2004/38 is based, as the necessary protection of State security cannot have the effect of denying the person concerned his right to be heard and, therefore, of rendering his right of redress as provided for in Article 31 of that directive ineffective.
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