Deputy Prime Minister Nick Clegg told the Leveson Inquiry that newspapers can increase the number of votes a party gets at a general election and that is "at the heart of a democratic contest".
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Transport Secretary Chris Grayling believes Network Rail should share the responsibility with private train operating companies.
Two vehicles were swallowed up by the sinkhole on Sunday night, killing Dora Linda Nishihara and injuring one man.
Elliott Livingstone, aged three, spent most of his life in hospital before the operation in April.