Vadher is currently lodged in a sub-jail in Gondal in Rajkot district.
CBI also moved the court of Additional Sessions Judge M M Vyas today with a request asking the jail authorities to bring Vadher to the Sabarmati Jail so that he could be questioned along with Solanki.
The court allowed the probe agency's application and instructions were issued to Sabarmati and Gondal's jail authorities accordingly.
Jethwa had filed several RTI queries and also a PIL in the Gujarat High Court on illegal mining in Gir forest, the abode of the Asiatic lion.
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The case was initially probed by Gujarat police which had arrested six persons, including Shiva Solanki, nephew of the MP, and alleged sharpshooter Sailesh Pandya who is accused of gunning down Jethwa outside the Gujarat High Court on July 20, 2010.
However, the police had ruled out any possibility of Solanki's involvement in the crime and gave him a clean chit, after which the slain activist's father approached the high court.