Opposition leader Simon Busuttil has filed two libel cases against l-Orizzont, claiming the newspaper is carrying out a mudslinging campaign orchestrated by the Prime Minister.
Dr Busuttil said an editorial, published on March 28, together with an article, published last Thursday, was defamatory and full of false allegations.
The articles claimed that Dr Busuttil had failed to declare all his income when he was still an MEP.
The Nationalist Party said that the mudslinging campaign persisted even though Dr Busuttil published all the accounts earlier last week in a statement.