ED summons Robert Vadra: What is the Haryana land deal case?

The Enforcement Directorate (ED) has summoned businessman Robert Vadra, the husband of Priyanka Gandhi and the brother-in-law of Rahul Gandhi, in the Haryana land deal case. Vadra, 56, was earlier asked to appear for questioning on April 8. But what do we know about the case?

Explainers