CENTCOM commander Joseph Votel argued that "reform of the Iraqi Security Forces (ISF) to achieve the goal of 'One ISF' remains a challenge. Iraq's Popular Mobilisation Forces (PMF) are officially part of the ISF, however, the forces are comprised of disparate groups, some of which are not totally responsive to the direction of the Government of Iraq, the worst of which are affiliated with Shiite militia groups directed by Iran". Votel added that "Iran's meddling in the selection of Iraqi cabinet members, notably the Minister of Defence and the Minister of Interior, has prevented the government from addressing pressing national security issues".