Bartolomé Mitre declared himself President of Argentina after the victory at the Battle of Pavón, under supervision of the Argentine National Congress.
It considered that he emerged triumphant from a revolution, that the peoples supported his rule, and that he got the duty of following the National Constitution and restore order.
The de facto government doctrine was introduced in 1930, after the coup of José Félix Uriburu against President Hipólito Yrigoyen.
[clarification needed] Informed of this, the Supreme Court legitimized the new government, "as long as it executes the administrative and political function derived from its possession of the force as guarantee of order and social security".
In cases of necessity and urgency (but excluding penal law), the new government was allowed to issue temporary legislation by decree, but these had to be authorised by the Court and would only remain in force if ratified by Congress.