NHS boss Sir David Nicholson has said he will not quit as he headed to a meeting of the board which has the power to sack him over the failings at Stafford Hospital.
Sir David remained defiant when approached by ITV News' Midlands Correspondent Rupert Evelyn in Manchester.
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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".