Federal MP Craig Thomson says he does not expect to be charged, despite a police raid on his New South Wales central coast home this morning.

New South Wales Police executed a search warrant at the Bateau Bay house on behalf of the Victorian Police fraud squad, as part of their investigation into the Health Services Union's national office.

They also raided Mr Thomson's electorate office in Tuggerah.

Mr Thomson, who served as HSU national secretary before being elected to Parliament, says he is confident the investigation will vindicate his repeated denials in relation to claims he misused union funds.

ABC journalist Mary-Louise Vince is following the story from Bateau Bay. Follow her on Twitter.

"I've done nothing wrong (and) we are fully cooperating with the police in relation to this investigation," Mr Thomson told reporters outside his home this morning.

"I am very confident that at the end of this investigation, I will be vindicated in terms of the position that I have taken from the start.

"[Police] took a couple of documents, I volunteered a couple of documents.

A police detective outside Craig Thomson's office. ( ABC: Mary-Louise Vince )

"Can I say the police acted in a thoroughly professional manner and showed great courtesy."

'Taken by surprise'

But Mr Thomson's lawyer Chris McArdle has lashed out at the way investigators handled the raid.

"Obviously, as is the normality in these things, the target of the search warrant was taken completely by surprise," Mr McArdle told ABC News Online.

"The scandalous aspect of this is that press arrived almost at the same time as the police and a camera crew was outside at almost the same time as the police.

"In other words, Mr Thomson knew nothing about this but every journalist in the country did.

"You'd have to ask - is the purpose of the raid the administration of justice or is the purpose of the raid continuing the campaign against my client?

"We are supremely confident that there will be no charge brought before a court by the police against our client, but someone is somehow or other seeing some benefit to someone in telling every journalist in the country that they're about to conduct a dawn raid."

NSW Police responded to the issue on Twitter, saying: "It is not our policy to alert media to such activity and no officer from NSW was authorised to do so."

Detective Senior Sergeant Peter Endler from Victoria Police, who accompanied NSW Police during the morning raid, said the search was carried out in the "normal" way.

"How the media obtain their information is of no relevance to our investigation," Detective Endler told reporters outside Mr Thomson's electorate office.

Police seized computers and documents from Mr Thomson's home.

Detective Inspector David Christey from NSW Police says the items will be taken back to Melbourne with the Victorian Police.

According to Mr McArdle, investigators took examples of Mr Thomson's handwriting, which he says will prove "beyond doubt" that his client did not sign any credit card dockets at brothels.

Police outside the home of crossbench MP Craig Thomson. ( ABC: Mary-Lou Vince )

'Holding up well'

Mr Thomson now sits on the crossbenches of Parliament as an independent MP, after his membership of the Labor Party was suspended in the wake of allegations he used union credit cards to pay for prostitutes, expensive hospitality and travel.

It is also alleged HSU funds were spent on Mr Thomson's election campaign to win the NSW seat of Dobell.

Mr Thomson has repeatedly denied any wrongdoing, and gave a heartfelt speech to Parliament earlier this year, rebutting a number of the allegations made against him, just before he moved to the crossbenches.

Mr McArdle says his client is holding up well, but adds that: "no human being could take this for much longer".

"The only reason that a life is being destroyed here is because of the closeness of the numbers in Parliament," Mr McArdle said.

"A life is being sacrificed on the altar of inconclusive election results."

Last week Fair Work Australia announced it had lodged 37 civil charges against Mr Thomson in relation to the alleged misuse of union funds.

If found guilty, Mr Thomson could potentially face fines and a compensation bill into the hundreds of thousands of dollars.

The Opposition has previously called on Mr Thomson to relinquish his seat in Parliament.

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Speaking in Adelaide this morning, Opposition Leader Tony Abbott said it was important that Mr Thomson cooperate with the police investigation.

"The police have shown a lot of diligence in trying to ensure that low paid workers' money is not misused," Mr Abbott said.

Liberal Senator Eric Abetz, who has been a key figure in the Coalition's campaign against the controversial MP, says this morning's police raid is a significant development.

"It is now clear that despite Mr Thomson's repeated claims to the contrary, he is a person of interest in both the Victorian and NSW Police Fraud Squad investigations," he said in a statement.

Senior Labor MP Anthony Albanese says it would not be appropriate for him to comment on the raid.

"People are entitled to a presumption of innocence - that's the system that we have, and it's a system that shouldn't be interfered with by politicians," he said.