Stung by Sonia Gandhi's broadside on the government's handling of the Covid crisis, BJP chief JP Nadda today wrote to the Congress president alleging "consistent negativity", duplicity and pettiness. He also flung criticism of large election rallies held by Prime Minister Narendra Modi right back at the Congress leadership. "Your party, under your leadership, is doing no favours to itself by opposing lockdowns and then demanding for the same (sic), ignoring the Centre's advisories on the second wave of Covid and then saying they did not get any information, holding massive election rallies in Kerala causing a spike in Covid cases while grandstanding about election rallies elsewhere, supporting protests but speaking about following Covid guidelines," Mr Nadda wrote.