Vadra will be quizzed in connection with land deals carried out at London, Bikaner, Delhi-NCR and other places.
Vadra had appeared before the ED on May 30 too, for questioning in the same case.
In a partial relief to Robert Vadra, CBI Special Court on Monday allowed him to travel abroad for six weeks for medical treatment.
Robert Vadra has been allowed to travel to USA and Netherlands but he can not travel to London.
Following which, Vadra withdrew his travel request to London.
The Court further added that in case any Look out Circular is issued, it will remain suspended during this period.
Vadra, facing investigation in a case under the Prevention of Money Laundering Act, was directed on April 1 not to leave the country without prior permission by a court which had granted him anticipatory bail while imposing several other conditions.