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Well, he's generally voted against further EU integration, he voted for the referendum and almost always voted against a right to remain for EU nationals already in living in the UK and against UK membership of the EU. So he seems like a pretty bad friend to have on Brexit anyway.
If he's saying stuff which seems appealing now it's probably like the time he voted consistently for the Iraq war then consistently for an investigation into it...
Yeah. I would also be very nervous of aligning in any way with someone like Grieve.