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1. The Constitutional Court shall have the competence of oversight on the constitutionality of the applicable laws and regulations and its judgments shall be issued in the name of the King; …
2. The Constitutional Court shall have the right to interpret the provisions of the Constitution if such is requested therefrom by a decision issued by the Council of Ministers or by a decision taken by either House of the Parliament by majority; … (Art. 59)

(c) The Supreme Court shall be the final authority on the interpretation of the Constitution, the law, or any other matter dealt with by a court of law. (Art. 145)

The law shall specify the competent judicial body for settling of disputes pertaining to the constitutionality of laws and regulations, define its powers and method of challenging and procedures to be followed before the said body. It shall also specify the consequences of judgment regarding unconstitutionality. (Art. 140)

1. The President of the Republic may request the Supreme Court of Justice to undertake an anticipatory review of the constitutionality of any statute submitted to him or her for promulgation.
… (Sec. 149)

The Constitutional Court shall, in the manner stipulated by the Law on the Constitutional Court:
1) Determine the conformity with the Constitution of laws, decisions of the National Assembly, orders and decrees of the President of the Republic, decisions of the Government and the Prime Minister, and sub-legislative normative legal acts;
2) Prior to the adoption of the draft Constitutional Amendments, as well as drafts of legal acts put to a referendum, determine their conformity with the Constitution;
3) Prior to the ratification of an international treaty, determine the conformity with the Constitution of obligations enshrined therein;
4) Resolve disputes arising between constitutional bodies with respect to their constitutional powers;
5) Resolve disputes related to decisions adopted with respect to the results of a referendum or the results of elections of the National Assembly and the President of the Republic;
6) Render a decision on termination of the powers of a parliamentarian;
7) Issue an opinion on the existence of a ground for impeaching the President of the Republic;
8) Render a decision on the impossibility for the President of the Republic to discharge his powers;
9) Solve the question of imposing disciplinary liability on a judge of the Constitutional Court;
10) Solve the question of terminating the powers of a judge of the Constitutional Court,
11) Solve the question on initiating criminal prosecution against a judge of the Constitutional Court or consenting to depriving him of liberty with respect to the performance of his duties; and
12) In cases stipulated by law, render a decision on suspending or prohibiting the activities of a party. (Art. 168)

The National People’s Congress exercises the following functions and powers:
…
(2) to supervise the enforcement of the Constitution;
… (Art. 62)

1. When the constitutionality of a law is at issue in a trial, the court shall request a decision of the Constitutional Court, and shall judge according to the decision thereof.
2. The Supreme Court shall have the power to make a final review of the constitutionality or legality of administrative decrees, regulations or actions, when their constitutionality or legality is at issue in a trial.
… (Art. 107)

In hearing a case by a Court, if there arises a dispute whether the provisions contained in any law contradict or conform to the Constitution, and if no resolution has been made by the Constitutional Tribunal of the Union on the said dispute, the said Court shall stay the trial and submit its opinion to the Constitutional Tribunal of the Union in accord with the prescribed procedures and shall obtain a resolution. In respect of the said dispute, the resolution of the Constitutional Tribunal of the Union shall be applied to all cases. (Sec. 323)

(1) The jurisdiction of the Supreme Court to ordinarily determine any such question as aforesaid may be invoked by the President by a written reference addressed to the Chief Justice, or by any citizen by a petition in writing addressed to the Supreme Court. ... In this paragraph “citizen” includes a body, whether incorporated or unincorporated, if not less than three-fourths of the members of such body are citizens.
… (Art. 121)

The President of the Republic, the two political party groups having the largest number of members in the Grand National Assembly of Turkey, and at least one-fifth of the total number of members of the Grand National Assembly of Turkey shall have the right to apply for annulment action directly to the Constitutional Court, based on the assertion of the unconstitutionality, in form and in substance, of laws, of presidential decrees, of Rules of Procedure of the Grand National Assembly of Turkey or of certain articles or provisions thereof. (Art. 150)