Here the Pope says yes: «When it is not possible to overturn or completely abrogate a pro-abortion law, an elected official, whose absolute personal opposition to procured abortion was well known, could licitly support proposals aimed at limiting the harm done by such a law and at lessening its negative consequences at the level of general opinion and public morality.» (firstthings.com)
But more significantly than Congressional opposition is every American's own personal opposition. (sensesofcinema.com)
Apparently the discussion led to a loud debate, and Nava's personal opposition to same - sex marriage quickly became a subject of discussion in the college. (firstthings.com)