G.R. No. L-47329 - Hidalgo vs. Marcos y Edralin

Ernesto C. Hidalgo, the petitioner, filed a petition for mandamus and/or prohibition seeking to compel actions arising from Presidential Decree No. 1229.
The petition primarily challenged the President’s refusal to convene the so-called "interim National Assembly" and questioned the constitutional validity of the referendum set for December 17, 1977.

The petition was filed at a time when constitutional amendments in 1976 had transformed the political system.
Notably, Amendment No. 1 of the 1976 amendments explicitly replaced the "interim National Assembly" with the "Interim Batasang Pambansa," thereby altering the mode of legislative convening.
The referendum question—“Do you vote that President Ferdinand E. Marcos continue in office as incumbent President and be Prime Minister after the organization of the Interim Batasang Pambansa as provided for in Amendment No. 3 of the 1976 Amendments to the Constitution?”—was central to the case.

The petitioner’s arguments, coupled with supporting documentation and rebuttals.
The Solicitor General’s Comment on the petition, which defended the government’s position on the validity of PD No. 1229 and the ensuing referendum.
Subsequent replies to the Comment by the petitioner.

The Court examined whether the President could be compelled to convene a legislative body that was no longer extant under the new constitutional framework.

The majority, through Resolution, resolved not to give due course to the petition and dismissed it immediately, basing the decision on:

The absence of a requirement to convene the interim National Assembly, given its replacement by the Interim Batasang Pambansa.
The interpretation that the referendum question did not amount to an amendment to the Constitution but rather sought to reaffirm or repudiate public confidence in the incumbent President.

Justice Munoz Palma dissented, arguing that PD No. 1229 was without constitutional and legal basis, emphasizing that the proposed referendum could effectively alter the structure of government.
Justice Teehankee also dissented, contending that the petition should be granted to enjoin the referendum, and he raised concerns over the procedural validity of the October 1976 Amendments and the nature of constituent power under the Constitution.

Whether the petition for mandamus and/or prohibition could be entertained against the backdrop of constitutional amendments that restructured the legislative body.
Whether the suit adequately presented a justiciable controversy involving the actions of the government, particularly regarding the convening of the legislative body.

Whether the referendum question, by its formulation, constituted an unauthorized amendment to the Constitution.
Whether calling a referendum under PD No. 1229, which asks the electorate to confirm or repudiate the President’s continued tenure and concurrent exercise of powers as Prime Minister, is constitutional.

Whether the President could be compelled by mandamus to exercise powers, such as convening the National Assembly (or its substitute), that had been altered by the 1976 constitutional amendments.
The extent to which a referendum may be used as a tool to either reaffirm the status quo or effect significant structural changes in government.