https://www.bbc.co.uk/news/uk-politics-48245499A cross-party Brexit deal will not get through Parliament unless it is subject to a confirmatory public vote, shadow Brexit secretary Sir Keir Starmer says.
They are obviously getting nowhere on a cross-party deal. IMO this is probably because they are trying to agree on the long term relationship issue - but this is waste of time as, even if the withdrawal then gets through, there is no way to ensure that whatever plan they agree on will be put into effect.
They need to agree to pass May's existing deal but with a scheme put in place that ensures full cross-party participation and agreement on the rest of (in fact the main) negotiations. If there is to be a second referendum it should be on the final trading deal - not the withdrawal agreement.
The whole second referendum idea is about to collapse: If, as expected, the Brexit party voters turn out in droves on May 23rd and eclipse the remain/peoples-vote vote , there is frankly no point in a second referendum and we will again be heading for a no-deal exit.
Anyone that wants to remain or have a second referendum must vote for one of the remain parties - not Labour (unless they commit to another referendum).