Though it was sent to Kerry well beforehand, the timing of the letter’s release comes just days after an Israeli soldier was filmed executing a Palestinian prisoner at close range – setting off fury in the Arab world and launching a military disciplinary process that has many on the Israeli right fuming.

Egypt’s inclusion may be no easier to navigate, as the military-backed Egyptian regime has proved a vexing problem for President Barack Obama as he has sought to balance the U.S.’s traditional concern for human rights with its need to maintain Cairo as an ally in an increasingly chaotic Middle East.

The U.S. is so wary of losing Egypt’s friendship it declined to call the military’s 2013 takeover over of the elected Muslim Brotherhood government a coup — a label that would have triggered a legal obligation to suspend military aid. Israel, meanwhile, remains America’s closest ally in the region despite tense relations between Obama and Prime Minister Benjamin Netanyahu, and it has received billions in U.S. military assistance over the years.

The letter questions the current mechanisms that the U.S. has to monitor its military assistance to both countries and asks for clarity on how the various divisions of the State Department “document and determine the credibility of information related to allegations of gross violations of human rights by foreign security forces.”