India, June 10 -- The Enforcement Directorate (ED) asked Congress leader Sonia Gandhi's son-in-law Robert Vadra to appear before it on Tuesday in connection with a money laundering probe linked to fugitive arms dealer Sanjay Bhandari, but the businessman sought another date for questioning, people familiar with the development said.

Bhandari, 61, is under investigation by multiple agencies, including ED, the Central Bureau of Investigation (CBI), the Income Tax department and the Delhi Police, for money-laundering, violation of foreign exchange as well as black money laws, and the Official Secrets Act for having access to sensitive defence documents.

The Indian government sent two extradition requests against the fugitive businessman wh...