Covid-19 vaccine, with party president J P Nadda alleging that whenever India achieves something commendable the opposition party comes up with "wild theories" to "ridicule" the accomplishments.Union Minister Hardeep Singh Puri also took a swipe at the opposition leaders, saying they are on a quest for permanent political marginalisation.His dig, however, drew a sharp retort from Congress leader Jairam Ramesh who compared him with Nazi propagandists.Nadda accused the Congress and other opposition parties of trying to cause panic among people to further their "failed politics and nefarious agendas". "Congress and the Opposition is not proud of anything Indian.