As of right now, gay marriage is legal based off of the case law resulting from the decisions of United States v. Windsor and Obergefell v. Hodges. These cases struck down Sections 2 and 3, respectively, of the Defense of Marriage Act (Section 1 was merely the short title). DOMA itself though was never repealed. Now, more than five years later, if Congress were to pass a law officially repealing DOMA, could they be sued by right-wing groups attempting to bring the legal question back?
We've already seen the tactics of completely ignoring Supreme Court precedent being used by those on the right with the legal crisis surrounding the Texas abortion ban. Would right-wing groups have any sort of luck suing a repeal of DOMA, or would a lower court make quick work of their complaint and rule against them, citing the above cases?
I guess, in short: if Congress repeals DOMA (in line with case law), could right-wing groups sue over that with any success?
Edit: I see my original question was not worded well, and it actually was not what I was attempting to ask. So, to rephrase: if Congress passes a law that explicitly allows gay marriage, could there be a lawsuit with any amount of success over that law?