In a statement here, SP spokesman Rajendra Chowdhury also alleged the BJP was hand in glove with the Centre in this game of the Congress.
"Conspiracy is on to trap the SP supremo in the CBI net for not supporting FDI and a bill on quota in promotions. The BJP is also hand in glove on the matter," he said.
To deal with Mulayam, the Centre had adoped a policy to "blackmail" him, Chowdhury alleged.
Even some former CBI Directors had admitted there was political pressure on the agency, he said.
Chowdhury, however, said "come what may, the SP will not change its stand."
"In the game of Congress, the BJP is also involved," he said.
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Yesterday, Mulayam had said in Mainpuri that his party would review support to the Congress-led UPA government if the quota bill was passed.
"The bill is anti-national and will divide the people. My party has opposed the bill inside and outside the House and will continue its opposition," he had said.