"Who is the leader of the federal front? It has not been decided who will give leadership to the front," WBPCC president Pradip Bhattacharya said.
"It is a vague idea. It has no political significance and no possibility." he said.
Banerjee told a TMC rally here that her party wanted a federal front of regional parties as an alternative to strengthen and safeguard the interests of states.
If such a front was in a position to form the next government, the TMC would give support, she said.