A bench headed by Chief Justice Mohit Shah said the court has rejected the PIL which was filed by journalist-turned- activist Ketan Tirodkar.
The petition said Sena's move to join the Devendra Fadnavis-led Maharashtra government is against the rules of the Assembly since members of the opposition party cannot switch over to the treasury benches, at least for six months after a trust vote is won.
The BJP-led Maharashtra government had opposed the PIL saying it was not in keeping with the provisions of the Constitution.
The petition said Shiv Sena had been in the opposition earlier but joined the government recently with ten of its legislators becoming ministers.
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The PIL had prayed to the High Court to direct Maharashtra Assembly Speaker Haribhau Bagde and Chief Minister Fadnavis to frame rules to prevent Sena MLA Eknath Shinde, the Leader of Opposition until recently, from taking up any ministerial post for a period of six months.
In a recent cabinet expansion, Shinde was made the Minister of Public Works (Public Undertakings) by the Chief Minister.