FINE Gael TD Peter Mathews has told the Dail Health Minister James Reilly's claim he will be able to control abortion is "childish".
Mr Mathews was quoting a letter he received from a doctor opposed to the abortion legislation, which also said: "Wars come and go, famines come and go, abortion comes and stays".
The letter also said "James Reilly's claim he will control this is childish".
The Dublin South TD again said he will not support the legislation.
"It is killing an unborn baby," Mr Mathews said. "And that is why at core I cannot support this bill."
He said the bill is "repugnant" to the Hippocratic Oath taken by doctors, and said including the threat of suicide as grounds for abortion places psychiatrists in a "horrible, repugnant dilemma".
Meanwhile, another Fine Gael TD has said he will vote against the Government's abortion bill.
Wicklow TD Billy Timmins has told the Dail he cannot support the bill, making him the third Fine Gael deputy to break ranks over the controversial legislation.
Mr Timmins joins Galway West TD Brian Walsh and Dublin South TD Peter Mathews, and said the bill has the "the direct intention of targeting... the life of the unborn child" for the first time Irish law.
"To claim otherwise is simply untrue," Mr Timmins said.