Prime Minister Narendra Modi on Monday spoke about the endorsement to Congress leader Rahul Gandhi and AAP chief Arvind Kejriwal by Pakistan and said it is a “matter of grave concern and calls for a thorough investigation”. PM Modi, in an interview to news agency IANS said, “I don’t understand why some select group of people, apparently those who harbour animosity against us, get endorsements from Pakistan, why voices of support emanate from there, for certain individuals.”