Lok Sabha Secretariat has sought explanation from Robert Vadra over his remarks on social networking site that led to a controversy in Lok Sabha last week. BJP MP Prahlad Joshi had moved a privilege motion against the son in-law of Congress President Sonia Gandhi. Sources say that the Secretariat has given Vadra a week to explain on the BJP MP's privilege motion.'<br/><br/>In his Facebook post , Vadra had taken a dig at the NDA government, without naming it, before the Monsoon session began. Protesting against it, Mr. Joshi had said in the Lok Sabha that Vadra's remarks had demeaned Parliamentarians and wanted the issue be referred to the Privileges Committee of Parliament and he be brought before the House. Speaker Sumitra Mahajan will take a decision on whether to refer the matter to the Privileges Committee after perusing Vadra's response.