Several of the Change UK MPs actively hate the Lib Dems -- and many of them disagree fundamentally with our principles (for example one was the head of No2AV), so I think mass defection is unlikely. I also don't think that vote-splitting in the election is likely -- they're not going to stand candidates in most places, I imagine, and polling suggests that even their current MPs are all going to lose their seats. That said, some of them would certainly be welcomed. The ones people keep mentioning as decent are Woolaston, Berger, and possibly Allen and Umunna. They're also the ones who seem likeliest to defect anyway. As for selecting the next leader -- the way it works is that any MP can stand for the leadership so long as they have the backing of at least 10% of our MPs, and then it's voted on by the membership as a whole. So if they were to defect before the sixth of June, they could theoretically get one of their members on the ballot, and then that member would lose to Jo Swinson.
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That said, some of them would certainly be welcomed. The ones people keep mentioning as decent are Woolaston, Berger, and possibly Allen and Umunna. They're also the ones who seem likeliest to defect anyway.
As for selecting the next leader -- the way it works is that any MP can stand for the leadership so long as they have the backing of at least 10% of our MPs, and then it's voted on by the membership as a whole. So if they were to defect before the sixth of June, they could theoretically get one of their members on the ballot, and then that member would lose to Jo Swinson.