Jones derailed the Queensland election campaign on Monday when he began the first of his "special" Brisbane broadcasts on Fairfax Radio 4BC and has spent the time since taking aim at the Newman government over its approval of the New Hope Acland coal mine stage three development.

Jones claimed Mr Newman had visited him before the 2012 election and told him he opposed the project, which was approved late last year.

Jones also highlighted donations which New Hope parent company, Washington H Soul Pattinson, made to both the federal and state Coalition, and linked them to the approval of the mine project.

Assistant minister to the Premier, Deb Frecklington, has also joined the defamation suit and Ian Rickuss, the LNP member for Lockyer, was also considering taking part.

A spokesman for Mr Springborg confirmed his involvement in the legal action.