New Jersey Governor Chris Christie said "there is no justification" for the behaviour of his former aide Bridget Kelly's over the bridge scandal.
Christie, a possible Republican White House contender, told a news conference, "There is no justification for ever lying to a governor or a person in authority in this Government".
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In the run-up to the 8 June General Election, the Labour leader said he wanted to find a way of "reducing that debt burden".
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