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UK News
The billionaire will remain involved in the company as executive chairman.
One in six businesses surveyed were already making redundancies, a chamber of commerce says.
The health secretary says "it's not happening", as ministers face questions about the prospect of tax rises.
The Unite union has criticised ministers and says the site could be "kept intact and operational".
Funding will be cut off unless Republicans and Democrats can agree a way forward on a spending bill.