Had Reagan vetoed the 1967 bill, which he wanted to, he would have been overridden by the CA Legislature so he signed it with the hope of watering it down. Admitting he made a terrible mistake and not really having a strong opinion on abortion as it was not the hot button topic as it is today, he immediately took up the mantle of life and promoted it for the rest of his days.
There are the facts and then there are the facts Trump supporters want to know so their liberal candidate looks less so.
If Trump’s abortion position is liberal so are 95% of the Republicans in Congress. They all have these exceptions whether you like them or not. I believe in no exceptions to abortion, but you don’t get elected in this country unless you say you have exceptions for rape, incest and life of the mother. And every single one of these politicians will tell you how “pro-life” they are. JEB Bush claims he’s a Catholic but threw his faith under the bus with his exceptions for abortion. During the debates he was never asked why he went against the Catholic Church on murdering the unborn.