Slapping a fresh notice on Mr Chavan, the EC asked him to appear before it in connection with an ongoing case of alleged expenses made by him during the 2009 polls which were categorised as "paid news".
Mr Chavan has been asked to attend the hearing in Delhi on May 23 "either in person or through his authorised representative or counsel".
In the second case, the EC has asked Mr Koda to appear in the hearing, either in person or through an authorised counsel, with regard to a case against him for allegedly furnishing false election expenditure records after the 2009 polls.
The EC's action comes a week after the Supreme Court gave a free hand to the Commission to enquire into complaints of paid news or incorrect expenses against a political leader.
A bench headed by Justice A K Patnaik had dismissed the plea of Mr Chavan challenging the commission's jurisdiction to enquire into such issues.
The EC, post complaints made against the two political leaders, had initiated disqualification procedures against them under the Representation of the People Act.
Both the leaders had challenged the EC's action as they denied any wrongdoing.
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