Adm. Mullen said the Haqqani Network has `` longstanding relationship '' with ISI . A senior Americans intelligence official says that relationship is `` that of an adversary '' As Joint Chiefs chairman , Mullen is the highest-ranking uniformed official in the U.S. military 's chain of command . `` Onus of providing proof on this '' rests with the Americans , the official says . Despite strain , Mike Mullen says leaders `` are very committed to working our way through this ''
Adm. Mullen said the Haqqani Network has `` longstanding relationship '' with ISI . A senior Americans intelligence official says that relationship is `` that of an adversary '' `` Onus of providing proof on this '' rests with the Americans , the official says . Despite strain , Mike Mullen says leaders `` are very committed to working our way through this ''