feuds that developed recently between karzai and u.s. officials whenever they've gone after karzai's associates on charges of corruption. now, if they investigate hamid karzai's own brother and anger him, that could effect a lot of u.s. operations on the ground in afghanistan. this is a very delicate tight rope that the u.s. is walking right now. background now on hamid karzai. he was educated in yiindia. he served as deputy foreign minister in the afghan government. after the fall of the soviet union, later he briefly aligned himself with the taliban but designed to become taliban ambassador to the united nations. in 1999, his father was murdered in pakistan by the taliban. two years later, mr. karzai worked with the u.s. government to overthrow the taliban in afghanistan. shortly after, he was chosen as interim leader of afghanistan. december 2004, mr. karzai was elected president of afghanistan. remains president right now. can the u.s. government assassinate an american citizen