Plans for a primetime TV Brexit debate to sell Theresa May’s deal to the public on the eve of the crucial parliamentary “meaningful vote” are in crisis after a week of infighting between broadcasters and the major parties over how it should be run.

Several sources close to the negotiations, including the deputy leader of the SNP, accused the BBC of creating the impression it is acting on behalf of Downing Street by proposing a format that favours Theresa May’s deal over any of the alternatives.

BuzzFeed News understands that the BBC’s original pitch to host the Brexit debate, delivered to Number 10 on Monday, suggested an hourlong BBC One show at 9 p.m. Thursday, Dec. 6, with the prime minister and leader of the opposition Jeremy Corbyn accompanied by a 20-strong panel.

The proposed panel would have consisted of members of the public, figures from public life, and politicians who have expressed different views on the government’s Brexit deal.

Ten members of the panel would have been in favour of the deal, while the other ten would have opposed it and argued for alternatives, ranging from a no-deal Brexit to single-market membership to a second referendum.

It would have included MPs from other parties with differing positions, including the Scottish National Party.

Two days later, on Wednesday, the BBC agreed to halve the size of the panel and move the debate to Sunday, Dec. 9.