The ABC has expressed concern about the exclusion of its journalists from a One Nation function on WA election night, saying it could be seen as an attack on both the broadcaster and the role of media in a democracy.

Journalists Nicolas Perpitch and Michael Edwards, from the national broadcaster, were refused entry to the event at Melville Bowling Club in Perth's south on Saturday night while party leader Senator Pauline Hanson addressed supporters.

ABC editorial director Alan Sunderland said in a statement that other media representatives attended on the night without any prior arrangements or permission being required.

"Those other media representatives, who included broadcasters, agencies and newspaper reporters from inside and outside Western Australia, were granted immediate access to the event," the statement said.

"The ABC was denied access, and was treated differently to all other media."

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Mr Sunderland said he had been in contact with One Nation since Saturday night seeking an explanation.

He said One Nation has claimed all media were treated appropriately and obtained material from a pool shoot.

However, he said the ABC had been singled out and excluded.

"Throughout the Western Australian election campaign, the ABC has provided accurate, impartial and independent political coverage and all political parties have been the subject of appropriate scrutiny and questioning," Mr Sunderland said.

"If the ABC has been denied normal access to political events for simply doing its job, then that is an attack not just on the public broadcaster but on the fundamental role of the media in a democracy.

"We will continue, as we always have, to report without fear or favour."

One Nation's actions 'unacceptable': MEAA

The Media, Entertainment & Arts Alliance (MEAA) described the ABC's exclusion as "unacceptable" and said it should not be repeated.

It is essential for public interest journalism that all accredited media outlets be given unrestricted access to political events, MEAA chief executive officer Paul Murphy said.

"MEAA agrees with the ABC that denying it normal access to political events for simply doing its job is an attack not just on the public broadcaster, but on the fundamental role of the media in a democracy," Mr Murphy said.

He added the MEAA was deeply concerned at any attempts by political parties or other public organisations to ban individual outlets or journalists because they did not like how they reported on them.

Malcolm Roberts responds on Twitter

Senator Hanson's media advisor James Ashby has not responded to a request for comment.

One Nation Senator Malcolm Roberts responded on Twitter to Mr Sunderland's statement, saying the ABC was barred because they refused to provide right of reply to the party.

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Pauline Hanson's One Nation is projected to take about 4.8 per cent of the vote in WA, far less than early polling which suggested it could be as high as 13 per cent.

WA Premier-elect Mark McGowan has also taken aim at One Nation for its election-night actions.

"I thought that was pretty disgraceful, and I think it says a lot about One Nation that they are prepared to do that sort of thing," he said.