The US is a signatory, but there is nothing in US law that makes being a signatory binding for the creation, amendment, or repeal of any US law. In fact, the op

The US is a signatory, but there is nothing in US law that makes being a signatory binding for the creation, amendment, or repeal of any US law. In fact, the opposite is true: the US explicitly maintains sovereignty for its domestic laws in the face of all UN agreements. It doesn’t need to leave the agreement. In general the US, as the world dominant cultural, military and economic power, signs agreements to bind others, not themselves.