Murder of foreign officials - a crime 18 U.S.C. 1116

It is a federal offense to intentionally select for killing 

18 U.S. Code § 1116 - Murder or manslaughter of foreign officials, official guests, or internationally protected persons

(a)

Whoever kills or attempts to kill a foreign official, official guest, or internationally protected person shall be punished as provided under sections 1111, 1112, and 1113 of this title.

(b)For the purposes of this section:

(1)

“Family” includes (a) a spouse, parent, brother or sister, child, or person to whom the foreign official or internationally protected person stands in loco parentis, or (b) any other person living in his household and related to the foreign official or internationally protected person by blood or marriage.

https://www.law.cornell.edu/uscode/text/18/1116