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What is Boris Johnson up to? Does he want to be sacked? Does he still think he's in with a chance of the top job? Or does he just want to highlight how weak Theresa May is? We ask why he's undermined the Prime Minister, just as she's about to set out her strategy for Brexit. Meanwhile, Sir Vince Cable genuinely thinks he could be the next PM, as UKIP consider a leadership candidate who's too extreme for most of UKIP. More at twitter.com/paulosbourne