Norwegian Prime Minister Jens Stoltenberg has promised that the country will remain "open and democratic".
And even if Mr Stoltenberg battles on, the odds against his re-election next year have risen.
Norwegian Prime Minister Jens Stoltenberg said 13 Norwegians were involved in the hostage situation.
Instead of tightening control, the Prime Minster Jens Stoltenberg vowed to fight the attacks with more democracy.
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He is due to meet Prime Minister Fredrik Reinfeldt of Sweden and Prime Minister Jens Stoltenberg of Norway later.
Mr Stoltenberg will now form the country's first majority government in two decades.
"We will do whatever we can to give them as much support as possible, " said Mr Stoltenberg of the families affected.
Mr Stoltenberg served a brief stint as prime minister five years ago.
Outside Norway some thought Mr Stoltenberg deserved the Nobel Peace Prize.
Bachelet, Brown, Lula da Silva and Stoltenberg will address the gathering Friday night to speak about charting a progressive path in response to the global economic crisis.
Now, with no obvious successor waiting in the wings and a general election due in September 2013, Mr Stoltenberg is hardly likely to volunteer to step down.
Prime Minister Jens Stoltenberg vowed to double down on Norway's traditions of liberal democracy in response to the attacks, and Breivik's trial appears to be no exception.
On Saturday, Prime Minister Jens Stoltenberg comforted victims and relatives alongside Norway's King Harald, Queen Sonja and Crown Prince Haakon in the town of Sundvollen, near Utoeya island.
The remaining make-up of newly elected Prime Minister Jens Stoltenberg's government further hints at the strategic importance he places on the future of the Arctic region and the Barents Sea.
One of the first announcements made by Mr Stoltenberg's government was that it will push ahead with oil exploration in the Barents Sea, in spite of vocal opposition from environmentalists.
The leaders attending the Progressive Governance Conference in the seaside resort city of Vina del Mar are Presidents Michelle Bachelet of Chile, Luiz Inacio Lula da Silva of Brazil, Christina Fernandez de Kirchner of Argentina and Tabare Vasquez of Uruguay as well as Prime Ministers Gordon Brown of Britain, Jose Luis Rodriguez Zapatero of Spain and Jens Stoltenberg of Norway.
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