US Ambassador: Chemical Weapon Attack Possible in US

U.S. ambassador to the United Nations Nikki Haley cautioned that chemical attacks similar to those in Syria "could happen" in the United States doesn't take more precautions domestically.

U.S. Ambassador to Mexico Resigns

Roberta S. Jacobson, the U.S. ambassador to Mexico, announced Thursday that she would step down from her diplomatic post in May.