He later appeared in Brisbane Magistrates Court and was granted bail.



Mr Black has been under investigation since a complaint was lodged last August, as revealed by Fairfax Media. It is understood police arrested him after he failed to appear for a scheduled interview on Wednesday morning.

Senator Malcolm Roberts and adviser Sean Black. Credit:Andrew Meares

In February, Senator Roberts defended Mr Black over media reports about him, branding them "fake news".

"While it's terrible that Pauline and I are subjected to lies and smears to try and discredit us politically, it's totally unacceptable that when they can't find dirt on us the media go after our staff," Senator Roberts said in a Facebook post.



"I have been working closely with Sean for the past five months and he is a great asset to our team and to Pauline's team, both as a hard working aide and as a personal friend. I have seen no evidence of the caricature he is painted to be, he loves his family, has a great sense of humour and is extremely well liked by all those who associate with him.

"Sean has my full support and will continue to have my full support in this office for as long as I am an elected official."