New Delhi: BJP MP Subramanian Swamy on Thursday said Congress president Sonia Gandhi and former prime minister Manmohan Singh should be summoned by the CBI on the AgustaWestland helicopter case.

"(Going by) the Italian court judgment, Sonia Gandhi, Manmohan Singh, Ahmad Patel and Oscar Fernandes should be summoned to the CBI headquarters and asked what they know about this (AgustaWestland helicopter case).