'The Conservative Party is embroiled in a row with Channel 4 over the broadcaster's decision to "empty chair" Boris Johnson during its election debate on climate change last night.
Minister Michael Gove offered to take his place, but the broadcaster said the invitation was for leaders only.
The party wrote to Ofcom saying placing an ice sculpture on the PM's podium was a "provocative partisan stunt".
Labour has accused Mr Johnson of "hiding from scrutiny".
Urging the regulator to take action against Channel 4, the Conservative Party accused the broadcaster of breaking its duty to be impartial and citing other alleged examples of bias.
In a letter to Ofcom, the party says Channel 4 News staged a "provocative partisan stunt, which would itself constitute making a political opinion in its own right" by substituting the PM with an ice sculpture.
Conservative sources also briefed journalists at BuzzFeed News and the Telegraph that "if we are re-elected we will have to review Channel 4's Public Services Broadcasting obligations".
Channel 4's public service broadcasting licence is up for renewal in 2024.
Former Conservative culture minister Ed Vaizey - who is not standing for re-election as an MP - said it was "perfectly legitimate" for the party to complain to the regulator about their lack of representation in the debate.
But he said it was not "sensible" for political parties to "threaten" broadcasters and he would be "disappointed" if the Conservatives took the matter any further after the election.'
Read more: Row over Boris Johnson climate debate 'empty chair'
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