Gov. Jim Doyle vetoed Senate Bill 138 earlier this month, rejecting legislation that would require physicians to inform women seeking abortions that their fetus may feel pain during the procedure.
Doyle said SB 138 inappropriately challenges the relationship between medical professionals and their patients.
'In any case, I trust doctors, not the Legislature, to make medical judgments,' Doyle said in his veto message.
'We should keep the doctor-patient relationship between doctors and patients and keep the Legislature out of it.'
Legislative Republicans said the governor is ignoring scientific fact: According to some studies, fetuses show response to pain as early as 20 weeks.
Under current law in Wisconsin, women must be informed of alternative measures to abortion as well as wait 24 hours before having the procedure performed.