Somaiya has demanded Rs one crore in damages.
He has also made Kalpana Inamdar, who, at a press conference, had made some allegations against Somaiya which the Saamana articles carried, a defendant in his suit which would come up before the Bombay High Court in due course.
Though BJP and Shiv Sena are alliance partners, their relations, ahead of next year's Mumbai civic polls, are quite strained.
Inamdar had alleged that Somaiya, through his wife, 'grabbed' a Slum Rehabilitation Authority Project.
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Somaiya claims to have a letter from SRA saying that he or his family has no connection with any of its projects.
Inamdar had also alleged that Somaiya and his wife invested black money in various companies in the names of his relatives. This allegation is also baseless and damaged his reputation, the BJP MP says in the suit.
He has also sought a permanent injunction restraining "Saamana" from republishing the defamatory articles or any other article which may harm his reputation.