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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Foreign Secretary Boris Johnson, who has outlined his opposition to Heathrow expansion, is visiting Afghanistan.
The US president welcomed King Abdullah II of Jordan for a working visit.
The former US first lady received a standing ovation after delivering a University of Oxford Romanes Lecture at the city’s Sheldonian Theatr