PM Stephen Harper launched a lawsuit March 13, 2008 against the Liberals over statements published on the party's website concerning the Chuck Cadman affair. This was the first time a sitting prime minister had sued the opposition for libel. The $2.5-million suit names the Liberal party, the Federal Liberal Agency of Canada and the unnamed author, or authors, of the statements published on the Liberal website two weeks ago. The articles at the centre of the lawsuit are headlined "Harper knew of Conservative bribery" and "Harper must come clean about allegations of Conservative Bribery". Those statements question Stephen Harper's alleged involvement in financial "offers" made to Cadman to sway his vote in a crucial 2005 Commons showdown. The suit filed Thursday in the Ontario Superior Court of Justice does not name Liberal Leader Stéphane Dion or MPs Ralph Goodale and Michael Ignatieff - whom Harper also threatened to sue.