It's the first time since 2009 a French president has addressed both houses.
It comes after at least 129 people were killed in attacks in Paris as they enjoyed a Friday night out in bars, restaurants, a concert hall and the national stadium.
Speaking to the packed chamber, President Hollande appealed for support from the international community to fight those who orchestrated the attacks in the French capital.
"Acts of war."
That's how the French President described the attacks in the country's capital.
In a rare address to both the Senate and the National Assembly, Francois Hollande called on the country's parliament to consider extending a state of emergency by three months.
"The security and resistance to oppressions are fundamental rights. So we have to exercise these rights. I have decided that the parliament will be examining as early as Wednesday a law the will extend the state of emergency for three months, and we will adapt its content to the evolution of the technologies, not the threats."
He said he wants increased international assistance to destroy the self-proclaimed Islamic State, or IS, which has claimed responsibility for the Paris attacks.
The French President declared that France is at war against IS, describing them as "cowards".
"The terrorists believe that free societies will be affected by horror. But it won't be at all. France has come through other tests, France is still here, alive and kicking and those that have tried to challenge France have always been history's losers."
Mr Hollande promised to increase funding for national security, strengthen anti-terrorism laws and boost border controls.
In a signal of political unity, parliamentarians gave the President a standing ovation before singing the national anthem.
Meanwhile, one of three brothers linked with the Paris attacks has been freed without charge.
Mohammed Abdeslam spoke to reporters about his brother Brahim, who was one of the suicide attackers who launched Friday's carnage.
He also spoke about his brother Salah, who is a key suspect and now a fugitive.
"My family and I are moved by what has happened. At no point we could have thought that my brothers were involved in this. We are thinking about the victims and their families, but you must understand that we have a mother and he remains her son."
26 year old Salah was reportedly stopped by officers as he crossed into Belgium after the attacks, but was released.
Belgium's Foreign Minister, Didier Reynders, says it's an international man-hunt.
"We need to exchange more and more intelligence because it's not only with national people. We have arrested a lot of French people in Brussels and we are knowing that there are many people crossing all the time from one city to another one."
A major police raid in the impoverished immigrant district of Molenbeek in western Brussels targeting Salah ended without any arrests.
French authorities also believe 27 year old Abdelhamid Abaoud may be the mastermind behind the attacks.
He is believed to be in Syria.
A number of arrests have been made after a series of raids across France, following the Paris attacks.
Police have found weapons, drugs, bullet-proof vests and mobile phones.
More raids are expected.
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