Country's president on May 29 signed Anti-Homosexuality Act
HRC among 170 letter signatories
Law punishes 'aggravated homosexuality' with death
National Security Council 'to evaluate' law's implications, U.S. engagement with country
Law calls for death penalty for 'aggravated homosexuality'
Measure still contains death penalty provision
Bill contains death penalty provision for 'aggravated homosexuality'
