He also asked the Left parties to have a "rethink" on their anti-Congress position.
"As far as there is the concern of Mulayam Singhji, we respect all our allies. He (Mulayam) also knows in his mind that the basic polarisation in this country is communal versus secular forces. He will also have to decide which side he is on," Tewari told reporters on the sidelines of a function here.
Tewari also expressed hope that the Samajwadi Party, which has extended "very constructive support" to the UPA government, will continue that and "the atmosphere of harmony will prevail."
Yadav had said recently that coalition politics has come to stay in the country and asked like-minded parties to come together. Samajwadi Party, with 22 MPs in the Lok Sabha, provides key outside support to UPA Government at the Centre.
"I think all progressive forces who do have the fundamental belief that secularism and pluralism is the way forth for the country and they do believe that the idea of India stands on liberal foundation, should need to introspect and need to rethink their position," he said supporting Union Minister Vayalar Ravi who reportedly suggested that the UPA should reach an understanding with the Left parties in the next Lok Sabha polls.