A Momentum spokesman told the Huffington Post UK that Channel 4’s investigation had exploited its “enthusiastic and young activists”, and that some allegations are “slurs or matters of opinion”.
He said: “Lawyers are looking at it and we’re minded to take this to Ofcom.”
They also insisted the group is not campaigning for deselections or mandatory reselection of MPs and “Labour members are free to organise as they see fit for candidate selections”.
It said any suggestions Momentum has been funded by Corbyn’s leadership campaign were false and claimed that in fact, Momentum has provided loans to Jeremy for Labour.
But Channel 4 is standing its ground.
A Channel 4 spokesperson said: “Channel 4 has a remit to deliver high quality news and current affairs, and a track record for investigative journalism and holding those in power to account.
“This is a vital piece of investigative journalism, on an issue of critical national importance to everyone in the UK particularly in a period of political flux.”