Farm leaders announce 'black day' on Friday to mourn the death; call for tractor marches on highways on February 26; and hold Mahapanchayat in Delhi on March 14.
Former PM Manmohan Singh, former Congress presidents Sonia Gandhi and Rahul Gandhi and party general secretary Priyanka Gandhi are already under the Z+ category.
The PM was speaking at the golden jubilee celebration of the Gujarat Cooperative Milk Marketing Federation which markets its products under the brand 'Amul'.
Rahul Gandhi launched a scathing attack on PM Modi, accusing him of undermining democracy through actions such as suppressing dissenting voices and using force against protesters.