Attorney-General George Brandis has warned against assuming all violent attacks are terrorism in the aftermath of the Munich shooting and urged people to be careful with the words they use.

"Not every mass casualty attack is an act of terrorism. Not every premeditated act of violence is an act of terrorism," Senator Brandis told ABC television's Insiders program on Sunday.

"Our law has a very specific definition of terrorism. Terrorism is an act of violence or a threat of violence perpetrated for a political, religious or ideological cause, to coerce government or to intimidate the public."

German authorities have said the teenage gunman who opened fire in a shopping centre in Munich on Friday was acting on his own and had no links to extremist groups.

But senator-elect Pauline Hanson suggested on her Facebook page on Saturday that religion was a motivating factor.

George Christensen, the Liberal National Party member for the Queensland seat of Dawson, also used Facebook to share a blogpost that said the 18-year-old behind the Munich shooting was a "jihad murderer".

In his post Christensen added the statement: "In a world gone mad, it took less than 48 hours for my admittedly incorrect remarks regarding the Merrylands police station attack to become valid in wake of commentary by the political and media elite on the Munich attack."

On Friday, Mr Christensen backtracked on the claims that an attack on a police station in Sydney's Merrylands was motivated by Islamist extremism. Police later said there was no link between the man who committed the attack and extremist groups. 

But Senator Brandis said it was too early to tell what motivated the teenage gunman in Germany.

"If we're going to understand this problem we have to anatomise it correctly. We must be very careful in our use of language so that we don't spray the word terrorism around too loosely," Senator Brandis said.

The Attorney-General also said Ms Hanson's views on Islam and immigration are "unhelpful" and "wrong" and must be defeated with reasoned debate and discussion. It would be "ludicrous" to suggest the views of senator-elect Hanson should be ignored, he told the program.

Although the views of Ms Hanson and her One Nation colleagues were "unhelpful and, frankly, wrong", Senator Brandis said the Coalition needed to address them.

"What we have to do is we have to engage her, we have to explain why the views that she expresses about, for example, the Muslim community are unhelpful and frankly wrong," he said.

"I have always believed that it is absolutely the wrong idea to try and silence such people, to silence that point of view because it's a point of view that exists in the community. Half a million people voted for Pauline Hanson or her candidates in the Senate."

The Coalition is trying to carefully manage its dealings with One Nation which could have three senators – Ms Hanson and one each from NSW and Western Australia – by the time the Senate count in finalised.

MPs were concerned when Prime Minister Malcolm Turnbull said during the election campaign that Ms Hanson had no place in the Parliament.

Mr Turnbull has since been more conciliatory and has spoken privately with Ms Hanson by telephone.

Labor frontbencher Chris Bowen said on Sunday the opposition would not be looking to One Nation for support for its positions in the Senate.

Although there would be times when the two parties voted the same way, Mr Bowen said they would "not be working together in a policy sense".

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