Posters saying "It's okay to be white" have appeared outside the offices of two federal MPs who were among the most strident in criticising Government senators for voting for a motion declaring the same.

Key points: The offices of Greens Senator Sarah Hanson-Young and Labor MP Anne Aly were targeted

The offices of Greens Senator Sarah Hanson-Young and Labor MP Anne Aly were targeted Both MPs were critical of Government senators supporting a One Nation motion including the same words

Both MPs were critical of Government senators supporting a One Nation motion including the same words The MPs have condemned the signs as racist

Both South Australian Greens Senator Sarah Hanson-Young and West Australian Labor MP Anne Aly, whose offices were targeted, have taken to social media to complain about the posters.

Earlier this month, Coalition senators voted for a motion moved by One Nation leader Pauline Hanson calling for the Senate to acknowledge the "deplorable rise of anti-white racism and attacks on Western civilisation" and that "it is OK to be white" — a phrase commonly used by white supremacists.

The following day, Prime Minister Scott Morrison described his senators' support for the motion as "regrettable".

The Government's Senate leader Mathias Cormann blamed an "administrative error" and Coalition senators voted against the motion the second time it was put up.

The posters appeared outside Senator Hanson-Young's office in Pirie Street, in Adelaide's CBD, this morning.

"This white supremacist slogan has no place in Adelaide and no place in 2018," Ms Hanson-Young said.

"Pauline Hanson's cheer squad spreading this white supremacist slogan in Adelaide is a direct attack on our welcoming, multicultural community."

Senator Hanson-Young said she had referred the posters to police, although she was unclear what crime might have been committed.

"Sadly, Pauline Hanson and One Nation have given licence to spread this hate," she said.

"The person who put these signs up should be ashamed of themselves.

"It is good to see many of these signs have been ripped down by decent people who will not stand for this divisive language being used in our streets."

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Dr Aly says posters are 'racial intimidation'

The posters were plastered on the windows of Dr Aly's office in the Perth suburb of Madeley.

Responding to the incident in a Facebook post, she said "words matter".

"When our leaders use white supremacist and neo-Nazi slogans in Parliament, and when the Government votes in favour of them, this happens," she said.

"It's okay to be you, whoever you are; but this racial intimidation and harassment is not okay."

Sorry, this video has expired Anne Aly slamming the "it's okay to be white" motion in October

The posters were not placed on the windows of Senator Hanson-Young's office, which is seven floors above ground level.

In Parliament on October 16, Dr Aly said it was "not okay to adopt white supremacist neo-Nazi mantras in this Parliament".

"Instead of joining Labor to condemn this silly motion and what can only be described as another 'look at me' stunt by Pauline Hanson and One Nation, the leaders in this Government instead issued a mealy-mouthed statement because they're embarrassed by their own Muppet show that continues to let down Australians and fails to represent a modern multicultural Australia," she said.

Not everyone on social media agreed with Senator Hanson-Young's criticism of the posters.

Twitter user "Vladesch" said it was "such a silly fuss over a sentence which is clearly true".

"That is unless you think its (sic) not ok to be white," they said.

"Then you must ask yourself if it's ok to be black. And if its (sic) not ok to be black then you're clearly a racist.

"But if its (sic) ok to be black and not white you're also a racist."