The Supreme Court today sought a response from the Election Commission by June 24 on a plea of the Gujarat Congress, challenging the poll panel's decision to hold separate by-polls for two Rajya Sabha seats in the state.<br />''<br />''A vacation bench of justices Deepak Gupta and Surya Kant listed the matter for hearing on June 25. The bench said It is not an issue which can be taken up through an election petition and therefore, required to be heard. The bench said We need to decide whether it is a casual vacancy or a statutory vacancy.<br />''<br />''The Rajya Sabha seats fell vacant following the election of BJP chief Amit Shah and Union Minister Smriti Irani to the Lok Sabha from Gandhinagar and Amethi respectively.<br />''<br />