The US has not ratified the Convention on the Rights of the Child, 25 years after signing it.
The United States joined other nations in signing a treaty on Wednesday to reduce mercury emissions...
The treaty, which is opposed by conservative home-schooling advocates, was defeated last year
The treaty fell short of the two-thirds needed for passage in the full Senate in 2012.
Senators tried to revive a UN treaty that is strongly opposed by many conservatives.