On being asked as to ongoing probe against his brother-in-law Robert Vadra, Congress chief Rahul Gandhi said that the government need not be selective.
He was in an interaction with students in Chennai when the question was thrown at him.
Prime Minister Narendra Modi should also be investigated in the Rafale jet deal, said the Congress President.
Congress chief was speaking to a gathering of hundreds of students at the Stella Maris college in Chennai as part of his campaign for the April-May national election.
He again raised his allegation of corruption in the deal for the purchase of 36 Rafale fighter jets from France, signed off by PM Modi in 2016.
The opposition alleges that the government agreed to an overpriced deal for jets from Dassault Aviation to facilitate an offset contract for industrialist Anil Ambani’s inexperienced defence company.
The government, Dassault and Anil Ambani have all strongly denied the allegation.