When did he say that? It would be good to put an addendum on our “Reagan: In His Own Words” book.
I may have read it in Peggy Noonan’s book, but I shall check and get back to you, petit.
Indeed, he signed into law a permissive abortion bill early in his California governorship which has resulted in more than one million abortions. He publicly later regretted this decision, and he said it was the biggest mistake he made in government.
Unless, of course, he made more than one "biggest mistake"!