Joint Registrar Neera Bharihoke directed Singh, the MLA from Delhi Cantonment, to file his response by August 6, as a last opportunity.
On May 18, Justice Hima Kohli had sought response from the MLA on Tanwar's plea that Singh had "misrepresented himself to be BA in 2012 from Sikkim University... Which amounts to corrupt practice within the meaning of the Representation of the People's Act 195."
Tanwar based his allegation on an RTI reply received from the Sikkim University which said it did not have any record of a student named Surender Singh.
"As per the academic record of the year 2014-15 and all the past academic years, there is no student by the name of Surender Singh," the RTI reply of Sikkim University read.
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On Tanwar's plea to declare Singh's election from Delhi Cantonment to be "void and the same be set aside," the High Court had sought the AAP MLA's response and posted the matter before Joint Registrar for completion of pleadings.
Singh is the second Aam Aadmi Party (AAP) MLA after former law minister Jitender Singh Tomar, who is facing allegations over educational qualification and has had to step down. Tomar was later arrested in the case.