Reply #182: you report it to the Secret Service!

[Native]

From their site: http://www.ustreas.gov/usss/faq.shtml

How can I report a threat towards a protectee?

Contact your nearest U.S. Secret Service field office which is listed in the "Emergency Numbers" section in the front of most phone books.

The Secret Service is interested in legitimate information relating to threats, plans or attempts by individuals, groups or organizations to harm Secret Service protectees. However, the agency does not desire or solicit information pertaining to individuals or groups expressing legitimate criticism of, or political opposition to, the policies and decisions of the government or government officials.