Hindustani, a former Bharatiya Janata Party (BJP) worker, was taken into custody Wednesday.
Special Judge Sunita Dhingra also extended the police custody of co-accused Sanjeev Saxena - the first to be arrested in the case July 16 - by a day. His three-day police remand ended Thursday.
Saxena, former private secretary of Rajya Sabha member Amar Singh, alleged that Amar Singh, then with the Samajwadi Party, had provided Rs.1 crore for buying the support of three BJP MPs in a trust vote in 2008.
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