Anders Behring Breivik's defense lawyers have tried to cast the confessed mass killer as a political militant motivated by an extreme rightwing ideology rather than a delusional madman who killed 77 people for the sake of killing, The Guardian reports.

In his closing arguments on the last day of his trial on Friday, June 22, the defense lawyer Geir Lippestad reiterated that Breivik accepted that he set off a bomb outside a government building and then gunned down dozens of teenagers at a Labor party youth camp in the way that the attacks were described in court.

"That little, safe Norway would be hit by such a terror attack is almost impossible to understand," Lippestad said. And that helps explain why psychiatric experts reached different conclusions about Breivik's mental state, he added.

Lippestad used his closing arguments to try to prove to the court that Breivik's claims of being a resistance fighter in a struggle to protect Norway and Europe from being colonized by Muslims were not delusional, but part of a political view shared by other rightwing extremists.

He also questioned assertions by one team of psychiatrists that the driving force behind Breivik's attacks was a psychotic impulse to kill, rather than a political ideology.

"July 22 was an inferno of violence," Lippestad said. "But we must also look at how he carried out the attacks to see whether it was violence in itself or radical politics that was the cause."

The panel of five judges is expected to make a ruling in July or August. If deemed mentally competent, Breivik would likely be given Norway's maximum prison term of 21 years. A sentence can be extended beyond that if a prisoner is considered a menace to society. If declared insane, he would be committed to a mental institution for as long as he is considered sick and dangerous to others. Prosecutors suggested on Thursday that could mean he would be held for the rest of his life.