ITV has scrapped its plans to hold a Brexit debate between Theresa May and Jeremy Corbyn this Sunday.
The channel said it had invited both parties to appear on the programme two days ahead of the meaningful vote on Mrs May’s withdrawal agreement.
But an ITV spokeswoman confirmed on Thursday that it would “not go ahead”.
It follows an announcement by the BBC on Tuesday, who also dropped plans for a Sunday night debate between leaders.
Channel 4 has announced it will hold a debate on Sunday featuring neither Mrs May or Mr Corbyn, but “four high profile politicians” – one backing the PM’s deal, one behind a softer Brexit, one for a harder Brexit and one supporting the People’s Vote.
It has not confirmed who the politicians will be.
The prime minster challenged the Labour leader to a televised debate last week after she started a campaign to encourage MPs to back her Brexit deal in a Commons vote on Tuesday 11 December.
Mr Corbyn accepted the challenge, but a row ensued between the parties regarding the format.
Mrs May accepted the offer of the BBC, who had wanted to include “a range of voices” in the programme, including members of other political parties, as well as a head-to-head between the leaders.
But Labour said the proposed format was a “mish-mash, with a lopsided panel of other politicians and public figures” taking part.
The party instead favoured ITV’s offer of a straight head-to-head debate – but this offer has now been withdrawn.
A spokeswoman for the channel said: “ITV invited the prime minister and leader of the opposition to appear in an ITV programme this Sunday evening, and we have been clear that it is up to those invited to decide whether they want to accept the invitation.
“ITV is developing its plans for covering the build up and reaction to the crucial Commons vote next Tuesday, and a range of voices and opinions will be represented on the subject of Brexit in our output.”