A Ministry of Defence spokesman has told ITV News that the US announcement on troop withdrawal from Afghanistan will be welcomed.
Asked if the announcement will impact on British troop withdrawal from the country, they added: "We have a plan in place and that's what we're sticking to."
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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.