That’s a very good question. The answer to which you will certainly not like will be evident.
The UN will be highly reluctant to meddle into the sovereign affairs of one of its permanent five members of the Security Council which is just one of six vital parts of the United Nations structure of governance.
The democratic apparatus of the UN is the General Assembly. If your question is submitted to the UN it has to be voted on first by a majority for recommendation or resolution. But since your question is a matter regarding peace and security too, coupled with being a human rights issue, then it is likely that it will be pushed along for consideration of the U.S. Security Council. Whatever the General Assembly decides as a recommendation it is also not binding on its members.
If the Security Council (U.S., China, Russia, France, and the UK) fails to act which they will most certainly do by one simple veto, then the General Assembly can recommend resolution to your question, but again it will not be binding. This is because the International Court of Justice which is in The Hague, Netherlands is judicially disempowered in their judgements of, or matters thereof with the world court. Your question may not even get as far as a simple hearing. If it does and a permanent member state disagrees with the judgement then it is as good as null and void simply because it would be like limiting that state’s powers of sovereignty. No permanent member state would be onboard with that, let alone the offending member.
This is just one of many deficiencies with the UN. The lack of an actual military is another — this requires sufficient and committed financing from said members states, especially from permanent member states.
The permanent member state — replete with nuclear and advanced weaponry — in question would never allow a UN military force to let’s say…invade KKK strongholds in the south or prevent the president of the U.S. from issuing directives that result in human rights abuses on its citizens.
It is far fetched but the discussion is rightfully needed and the deficiencies of the UN needs to be addressed. The UN Secretary, in the role of a spokesperson for the UN can broach this subject in speeches or official statements but that is as far as it goes and based on who that is in the lead photo for your article — that would never happen.