their duties. The Constitutional Council shall be consulted with regard to such measures. Parliament shall convene as of right. The National Assembly shall not be dissolved during the exercise of the emergency powers. Article 16, allowing the president a limited form of rule by decree for a limited period of time in exceptional circumstance, has been used only once, by Charles de Gaulle during the Algerian War, from 23 April to 29 September 1961. Article 17: The president of the republic has the right to grant pardon. Article 18: The president of the republic shall communicate with the two assemblies of Parliament by means of messages, which he shall cause to be read and which shall not be the occasion for any debate. He can also give an address in front of the Congress of France in Versailles. Outside sessions, Parliament shall be convened especially for this purpose. Article 19: Acts of the president of the republic, other than those provided for under articles 8 (first paragraph), 11, 12, 16, 18, 54, 56 and 61, shall be countersigned by the prime minister and, where required, by the appropriate ministers. Presidential amnesties Before the 2008 constitutional reform forbidding them, there was a tradition of so-called "presidential amnesties", which are something of a misnomer: after the election of a president, and of a National Assembly of the same party, parliament would traditionally vote a law granting amnesty for some petty crimes (it was also a way of reducing jail overpopulation). This practice had been increasingly criticized, particularly because it was believed to inspire people to commit traffic offences in the months preceding the election. Such an amnesty law would also authorize the president to designate individuals who have committed certain categories of crimes to be offered amnesty, if certain conditions are met. Such individual measures have been criticized for the political patronage that they allow. The difference between an amnesty and a presidential pardon is that the former clears all subsequent effects of the sentencing, as though the crime had not been committed, while pardon simply relieves the sentenced individual from part or all of the remainder of the sentence. Criminal responsibility and impeachment Articles 67 and 68 organize the regime of criminal responsibility of the president. They were reformed by a 2007 constitutional act in order to clarify a situation that previously resulted in legal controversies. The president of the Republic