The 114th United States Congress assembled in January 2015 with Republicans in control of the Senate, and McCain achieved one of his longtime goals when he became chairman of the Armed Services Committee. In this position, he led the writing of proposed Senate legislation that sought to modify parts of the Goldwater-Nichols Act of 1986 in order to return responsibility for major weapons systems acquisition back to the individual armed services and their secretaries and away from the Under Secretary of Defense for Acquisition, Technology and Logistics. As chair, McCain tried to maintain a bipartisan approach and forged a good relationship with ranking member Jack Reed. In April 2015, McCain announced that he would run for a sixth term in Arizona's 2016 Senate election. While there was still conservative and Tea Party anger at him, it was unclear if they would mount an effective primary challenge against him. During 2015, McCain strongly opposed the Obama administration's proposed comprehensive agreement on the Iranian nuclear program (later finalized as the Joint Comprehensive Plan of Action (JCPOA)), saying that Secretary of State Kerry was "delusional" and "givaway the store" in negotiations with Iran. McCain supported the Saudi Arabian-led military intervention in Yemen against the Shia Houthis and forces loyal to former President Ali Abdullah Saleh, saying: "I'm sure civilians die in war. Not nearly as many as the Houthis have executed."