The decision follows several controversial changes in the country over the last twelve years.
The measure was adopted unanimously.
"Now I hope, please understand, that I just want to give my child the chance to live,” he told AM 1020 radio.
Pro-life leader Guadalupe Batallán tweeted Monday that “María del Valle was 23 years old and had her whole life in front of her."
Pro-abortion activists have been active in Argentina over the last months where they have managed to make abortion legal.
The law in force so far permitted abortion only when the pregnancy was a result of rape or when it put the mother's life at risk.
The facade of Our Lady of the Rosary Cathedral in Moreno, Buenos Aires was vandalised in late November by abortion activists.
Until now, only Uruguay, Cuba, Guyana and parts of Mexico have allowed the partial legalisation of killing the unborn on request.