Businessman and Federal MP Clive Palmer has followed through on his threat to sue Queensland Deputy Premier Jeff Seeney.
Documents have been filed in the Supreme Court, seeking about $1.1 million in damages for defamation.
Mr Seeney says Mr Palmer sought preferential treatment for his coal mining projects in 2012, and sent documents to the Crime and Misconduct Commission for consideration.
Mr Palmer has denied the claims.
He is already suing Premier Campbell Newman for defamation.