It could be a federal constitutional issue under the Full Faith and Credit Clause and Equal Protection Clause (rational basis test). These would be issues to enforce the Constitutional requirements between the states, not excuses for the federal government to itself decide on issues like marriage or abortion or the million other things they have no business deciding.
These would be issues to enforce the Constitutional requirements between the states, not excuses for the federal government to itself decide on issues like marriage or abortion or the million other things they have no business deciding. Abortion is in violent opposition to the clearly-stated natural law assertions of self-evident truth of our nation's charter, the Declaration of Independence, every single clause of the stated purposes of the U.S. Constitution, and the explicit, imperative requirements of that Constitution.
State sovereignty does not trump the God-given, equal, unalienable rights of the people. Never has, never will. Those rights precede and supersede all. To claim otherwise is to dynamite all the foundations of American self-government, including its cornerstone.
The raison d'etre of government, ALL government, is to protect Life and Liberty.
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men..."
“Among the natural rights of the Colonists are these: First, a right to life; Secondly, to liberty; Thirdly, to property; together with the right to support and defend them in the best manner they can. These are evident branches of, rather than deductions from, the duty of self-preservation, commonly called the first law of nature. … it is the greatest absurdity to suppose it in the power of one, or any number of men, at entering into society, to renounce their essential natural rights, or the means of preserving those rights; when the grand end of civil government, from the very nature of its institution, is for the support, protection, and defense of those very rights; the principal of which, as is before observed, are Life, Liberty, and Property. If men, through fear, fraud, or mistake, should in terms renounce or give up any essential natural right, the eternal law of reason and the grand end of society would absolutely vacate such renunciation. The right to freedom being the gift of God Almighty, it is not in the power of man to alienate this gift and voluntarily become a slave.” – Samuel Adams, The Rights of the Colonists, The Report of the Committee of Correspondence to the Boston Town Meeting, Nov. 20, 1772