Party leader Amar Singh said, "Until Prime Minister makes a public statement allaying apprehensions on the nuclear deal in Parliament or outside it will be difficult for SP to support the deal. I cannot dictate to Prime Minister what he should say. He can say in whatever way he wants."

Amar Singh said that his party had told Narayanan the apprehensions on the deal as conveyed to it by the Left parties.

He also said the government must explain its vote against Iran in the IAEA saying that it compromised India's sovereignty.

Earlier, Samajwadi Party chief Mulayam Singh Yadav and general secretary Amar Singh on Wednesday went to an undisclosed place for a briefing by NSA on the Indo-US nuclear deal.

The government had decided to brief the SP leaders after they claimed that they did not know any "new" detail of the nuclear deal and hence could not decide whether or not to support the UPA on it.

The SP has 39 members in Lok Sabha and they would be crucial for the government's survival if the Left parties carry out their threat to withdraw support over the deal.

Meanwhile, the Samajwadi Party appeared to delink the issue of support to UPA government from the nuclear deal projecting communalism as the "biggest challenge" facing the country.

Amar Singh claimed that even the Left, which had threatened to withdraw support to UPA government, was against early Lok Sabha polls.

"During my talks with Karat, I requested him to unite against communalism. Even he is against early general elections," Singh said.

Amar Singh's comments came after hectic parleys amongst its top leadership including party chief Mulayam Singh Yadav who on Tuesday made it plain that there were "no political enemies" for SP.

Amar Singh, however, sidestepped a volley of questions whether SP would support the nuclear deal. Mulayam Singh Yadav too was evasive over the issue.

Amar Singh's refrain was that communal forces posed a bigger danger to the country and secular forces would ill afford an early Lok Sabha elections.

"Communalism is the biggest challenge facing the country today. We identified it as a major issue during the meeting of the party's Parliamentary board," Singh said.

The SP general secretary also claimed that the UNPA, which is meeting here tomorrow in the backdrop of the political stalemate over the nuclear deal, would not split over the issue and continue to be united.

"We will not break and our policies will also not break," he said. Singh dismissed as 'big lie' reports suggesting that SP was angling for key Cabinet berths at the Centre in lieu of its support. The SP leader projected that the BJP and the BSP were coming together. "This was clear from Advani's rally in Kanpur recently, where he declared SP as BJP's enemy number one. He opened all his cards there and showed his openness towards BSP," Singh said.

Attacking the BSP, Singh said that Mayawati openly campaigned for Narendra Modi during Gujarat polls "and it became clear from Advani's speech in Kanpur that BSP is the B-team of BJP".

Describing BSP as a party that plays "opportunistic politics", Singh said that it has ditched SP, Congress and even BJP thrice in the past, "yet BJP is now wooing BSP". He said that opportunistic forces thrive all time.

"Paswan's Lok Janshakti Party and DMK are in UPA and were in NDA government also. Today every party is secular, except us."

Earlier in the day, Yadav arrived at Singh's residence here and after a brief meeting, both the leaders left for party colleague Janeshwar Mishra's residence.

After an hour-long meeting with Mishra, both Singh and Yadav left. Singh told mediapersons waiting outside Mishra's residence that their meeting with National Security Adviser M K Narayanan would be held in the evening at 5 pm. He refused to divulge the venue of the meeting. — Agencies