Over half the public (53%) think Maria Miller's behaviour in relation to her expenses is "typical of most or all MPs", a new ITV News/ComRes poll has found.
The survey of 1,000 adults also found the controversy had made 49% of people trust politicians less.
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Political parties across the country suspended their General Election campaigns following the Manchester Arena terror attack on Monday.
Investigators believe Mr Kushner has significant information relevant to their inquiry, officials told NBC News.
The men were detained as part of an investigation by MI5 and the Metropolitan Police's Counter Terrorism Command.