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1. The constitutional precepts with regard to rights, freedoms and guarantees are directly applicable and are binding on public and private entities.
… (Art. 18)

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2. The ordinary law prior to the entry into force of the Constitution is maintained on condition that it is not contrary to the Constitution or the principles enshrined therein. (Art. 290)

1. Every citizen enjoys the rights and is subject to the duties enshrined in the Constitution.
… (Art. 12)

1. A declaration of unconstitutionality or illegality with generally binding force has effect as of the moment at which the norm declared unconstitutional or illegal came into force, and causes the revalidation of any norms that the said norm repealed.
2. However, in the case of unconstitutionality or illegality due to breach of a subsequent constitutional or legal norm, the declaration only has effect as of the moment at which the latter came into force.
… (Art. 282)

1. Sovereignty is single and indivisible and lies with the people, who exercise it in the forms provided for in the Constitution.
2. The state is subject to the Constitution and is based on democratic legality.
3. The validity of laws and other acts of the state, the autonomous regions, local government and any other public entities is dependent on their conformity with the Constitution. (Art. 3)

1. The fundamental rights enshrined in the Constitution shall not exclude any others set out in applicable international laws and legal rules.
2. The constitutional precepts concerning fundamental rights must be interpreted and completed in harmony with the Universal Declaration of Human Rights. (Art. 16)

1. The norms and principles of general or common international law form an integral part of Portuguese law.
2. The norms contained in duly ratified or approved international conventions come into force in Portuguese internal law once they have been officially published, and remain so for as long as they are internationally binding on the Portuguese state.
3. The norms issued by the competent organs of international organisations to which Portugal belongs come directly into force in Portuguese internal law, on condition that this is laid down in the respective constituent treaties.
4. The provisions of the treaties that govern the European Union and the norms issued by its institutions in the exercise of their respective competences are applicable in Portuguese internal law in accordance with Union law and with respect for the fundamental principles of a democratic state based on the rule of law. (Art. 8)

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7. With a view to achieving an international justice that promotes respect for the rights of the human person and of peoples, and subject to the provisions governing complementarity and the other terms laid down in the Rome Statute, Portugal may accept the jurisdiction of the International Criminal Court. (Art. 7)

1. If the Constitutional Court pronounces the unconstitutionality of a norm contained in any decree or international treaty, the President of the Republic or the Representative of the Republic, as appropriate, must veto the legislative act and return it to the entity or organ that passed it.
2. In the case provided for in paragraph (1), the decree may not be enacted or signed unless the entity or organ that passed it expunges the norm that has been held unconstitutional, or, where applicable, the entity or organ confirms the norm by a majority that is at least equal to two thirds of all Members who are present and is greater than an absolute majority of all the Members in full exercise of their office.
… (Art. 279)

1. Norms that contravene the provisions of the Constitution or the principles enshrined therein are unconstitutional.
2. On condition that the norms in question are applied in the legal order of the other party, the organic or formal unconstitutionality of properly ratified international treaties does not prevent the application of the norms they contain in the Portuguese legal order, save if that unconstitutionality results from the breach of a fundamental provision of the Constitution. (Art. 277)