Boris Johnson looked visibly uncomfortable this morning when asked to elaborate on his recent comments that he would like to be Prime Minister.
The Mayor of London, who refused to reiterate that attaining control of Britain's top political office was his ambition, told the BBC's Andrew Marr Show: "It's not going to happen."
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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.