Democratic lawmakers in New Jersey are once again trying to enact legislation—already vetoed twice by Republican Gov. Chris Christie—that would permit legally binding gestational carrier agreements.

In such a contract, a woman agrees to carry the fertilized egg of another woman through pregnancy. S-1238, like its predecessors, would require the surrogate mother to immediately forfeit all maternity rights, which the state Supreme Court deemed untenable in its watershed ruling decades ago in the Baby M case.

Christie vetoed similar bills in 2015 and 2012, but sponsors and supports insist they will continue their efforts.