Labour MP and former member of the General Synod of the Church of England, Frank Field, has been rushed to hospital after collapsing.
The member for Birkenhead is being treated at Liverpool Heart and Chest Hospital but the nature of his illness is unclear.
A Labour Party spokesperson said: "He is responding well to treatment."
Mr Field, 73, has been in the House of Commons since 1979 and also served time on the Church of England's decision making board.
He was one of the strongest political supporters of woman bishops and often spoke out in favour of the change.
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