The viability of a high-tech barrier to detect illegal border crossers remains uncertain, after a pilot project struggles.
In Yuma, Ariz., border patrol agents tout the success of a high triple-and double-layered wall. But such a fence is unlikely to stretch the entire border.
Critics say a plan to import up to 20,000 tons of low-level waste from Italy, the biggest import ever, could lead to even larger flows.
Security Council members, plus Germany, agree Tuesday on the outline of a third UN resolution.