A succession of Republican presidents have appointed justices to the Court in the hope & expectation that they would vote to overrule Roe. Thus far, they've been disappointed, as justices like John Paul Stevens (Ford), Sandra Day O'Connor (Reagan), Anthony Kennedy (Reagan), & David Souter (H.W. Bush) have risen above partisan ideology to preserve the fundamental right of women to control their own lives & destinies, i.e. the right recognized by the Supreme Court 46 years ago.
Interestingly enough, I read somewhere that Stevens in an interview mentioned that in his confirmation hearings - no one asked him about his opinion on Roe, which had only been decided three years earlier.