"Who is Sushma Swaraj to comment on Soniaji and the UPA government...She need not give certificate to the central government," Prasad told reporters.
RJD is supporting Manmohan Singh government from outside.
He also assailed Chief Minister Nitish Kumar for making strong remarks on the UPA government in the wake of Supreme Court's strong comments on Coalgate issue.
"The Central government will reply to the Supreme Court...Why Sushma and Nitish are feeling pain?" Prasad, Lok Sabha member from Chhapra, wondered.
The rally is seen as Prasad's show of strength before the 2014 elections and also an effort to oust the NDA government in the state headed by Nitish Kumar, from power.