His comments came after reports suggested that the government might set up an expert group headed by the Prime Minister's special envoy for the nuclear deal, Shyam Saran, to study the agreement in the light of the Left's objections on the pact.
The ruling Congress has already rejected the BJP's demand for a joint parliamentary committee on the nuclear deal, which the Opposition says will limit India's strategic options.
"The government must wait for the recommendations of such a committee and until then the process should be halted," Malhotra said.
The Opposition, however, has no immediate plans to bring a no-confidence motion against the government.
Malhotra also said the BJP will raise in Parliament its objections to the government's agriculture policy.
It has also sought a debate in the House on the release of Bofors case accused Ottavio Quattrocchi in Argentina.
"There have been reports how the case was botched up by the Government and the CBI. We will raise this issue vociferously," Malhotra said.