The Roscommon Fianna Fáil TD, Michael Finneran, has said he will not stand for the party in the next General Election if Health Service Executive proposals to withdraw in-patient surgery facilities at the county hospital are accepted by the Government.
Mr Finneran was speaking at a public meeting organised by the Roscommon Hospital Action Committee and attended by more than 700 people.
He accused the HSE of going ahead with a plan to downgrade the hospital without approval of the Tánaiste and Minister for Health, Mary Harney.
Mr Finneran is to meet the Taoiseach, Bertie Ahern, and Ms Harney to outline his position next week.
Roscommon County Hospital was one of the units identified for downgrading in the Hanly report.
And despite a commitment on its future last year from Mr Ahern, the HSE is proposing to withdraw inpatient surgery facilities and formalise a working link with Portiuncula Hospital in Ballinasloe.
New consultants will be appointed to work in both hospitals but there is anger over the move in Roscommon.