Which Xmas gag made Chris Mason laugh at PMQs?

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Which Xmas gag made Chris Mason laugh at PMQs? Why has a former Labour mayor joined the Green party? Whose interview has lifted the lid on Donald Trump's White House? And who will be the MMP for North Durham? Matt Chorley brings you the who, what, where, why and when of British politics. If you've got urgent questions... then email [email protected]