The daughter of former US President Bill Clinton made the comments in a SiriusXM interview on Thursday.
She talked about her efforts to keep abortion legal in the US and said: "Every day I make the moral choice to be optimistic that my efforts and my energies, particularly when I'm fortunate enough to be in partnership with fellow travellers, hopefully will make a difference."
Clinton said that before the landmark US Supreme Court decision that legalised abortion, many women were dying due to unsafe abortion practices and insisted that the country could not go back to such a time.
"When I think about all of the statistics today in our country... and how many women died and how many more women were maimed because of unsafe abortion practices, we just can't go back to that," she said.
"That's unconscionable to me, and also, I'm sure that this will unleash another wave of hate in my direction, but as a deeply religious person, it's also unchristian to me."
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