Rex W. Tillerson

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Sen. Chris Murphy, D-Conn., poses a question to Secretary of State-designate Rex Tillerson during testimony before the Senate Foreign Relations Committee on Capitol Hill in Washington, Wednesday, Jan. 11, 2017, (AP Photo/Steve Helber)

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In this July 21, 2017, photo, Secretary of State Rex Tillerson speaks to the media while meeting with Oman's Foreign Minister Yusuf bin Alawi bin Abdullah at the State Department in Washington. (AP Photo/Jacquelyn Martin, File)

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FILE - In this May 28, 2014 file photo, ExxonMobil CEO Rex Tillerson listens to a reporter's question after the annual meeting ExxonMobil shareholders meeting in Dallas. The Treasury Department hit Exxon Mobil Corp. with a $2 million fine Thursday for violating Russia sanctions while Secretary of State Rex Tillerson was the oil companys CEO. (AP Photo/LM Otero, File)

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FILE - In this Nov. 7, 2016, file photo, ExxonMobil CEO and chairman Rex W. Tillerson gives a speech at the annual Abu Dhabi International Petroleum Exhibition & Conference in Abu Dhabi, United Arab Emirates. The Treasury Department hit Exxon Mobil Corp. with a $2 million fine on July 20, 2017, for violating Russia sanctions while Tillerson was the oil company's CEO. Treasury said in a statement that Exxon under Tillerson's leadership had shown reckless disregard for sanctions that the Obama administration imposed on Russian entities in 2014 over Russias annexation of Crimea. (AP Photo/Jon Gambrell, File)

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In this May 28, 2014 file photo, ExxonMobil CEO Rex Tillerson listens to a reporter's question after the annual meeting ExxonMobil shareholders meeting in Dallas. The Treasury Department hit Exxon Mobil Corp. with a $2 million fine Thursday for violating Russia sanctions while Secretary of State Rex Tillerson was the oil company’s CEO. (AP Photo/LM Otero, File)

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FILE - In this Nov. 7, 2016, file photo, ExxonMobil CEO and chairman Rex W. Tillerson gives a speech at the annual Abu Dhabi International Petroleum Exhibition & Conference in Abu Dhabi, United Arab Emirates. The Treasury Department hit Exxon Mobil Corp. with a $2 million fine on July 20, 2017, for violating Russia sanctions while Tillerson was the oil company’s CEO. Treasury said in a statement that Exxon under Tillerson’s leadership had shown “reckless disregard” for sanctions that the Obama administration imposed on Russian entities in 2014 over Russia’s annexation of Crimea. (AP Photo/Jon Gambrell, File)

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U.S. Secretary of State Rex Tillerson, left, meets with Saudi Foreign Minister Adel al-Jubeir in Jiddah, Saudi Arabia, Wednesday, July 12, 2017. Tillerson has held talks with the king of Saudi Arabia and other officials from the countries lined up against Qatar, but there has been no sign of a breakthrough so far in an increasingly entrenched dispute that has divided some of America's most important Mideast allies. (U.S. State Department, via AP)

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U.S. Secretary of State Rex Tillerson, left, participates in a ministerial meeting with the foreign ministers of Bahrain, Egypt, Saudi Arabia, and the United Arab Emirates, in Jiddah, Saudi Arabia, Wednesday, July 12, 2017. Tillerson has held talks with the king of Saudi Arabia and other officials from the countries lined up against Qatar, but there has been no sign of a breakthrough so far in an increasingly entrenched dispute that has divided some of America's most important Mideast allies. (U.S. State Department, via AP)

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U.S. Secretary of State Rex Tillerson, left, meets with Saudi King Salman, right, in Jiddah, Saudi Arabia, Wednesday, July 12, 2017. Tillerson has held talks with the king of Saudi Arabia and other officials from the countries lined up against Qatar, but there has been no sign of a breakthrough so far in an increasingly entrenched dispute that has divided some of America's most important Mideast allies. (U.S. State Department, via AP)

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In this photo released by Qatar News Agency, U.S. Secretary of State Rex Tillerson arrives in Doha, Qatar, Tuesday, July 11, 2017. Tillerson arrived in Qatar as he tries to mediate a dispute between the energy-rich country and its Gulf neighbors. The visit is Tillerson's second stop on a shuttle-diplomacy tour that is also expected to take him to Saudi Arabia, which shares Qatar's only land border and is the most powerful of the four countries lined up against it. (Qatar News Agency via AP)

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U.S. Secretary of State Rex Tillerson meets with the Emir of Qatar, Sheikh Tamim Bin Hamad Al Thani at the Sea Palace, in Doha, Qatar, Tuesday, July 11, 2017. Tillerson arrived in Qatar as he tries to mediate a dispute between the energy-rich country and its Gulf neighbors. The visit is Tillerson's second stop on a shuttle-diplomacy tour that is also expected to take him to Saudi Arabia, which shares Qatar's only land border and is the most powerful of the four countries lined up against it.(Alexander W. Riedel/US State Department via AP)

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The Emir of Qatar, Sheikh Tamim Bin Hamad Al Thani, left, welcomes U.S. Secretary of State Rex Tillerson to Sea Palace, his official residence, in Doha, Qatar, Tuesday, July 11, 2017. Tillerson arrived in Qatar as he tries to mediate a dispute between the energy-rich country and its Gulf neighbors. The visit is Tillerson's second stop on a shuttle-diplomacy tour that is also expected to take him to Saudi Arabia, which shares Qatar's only land border and is the most powerful of the four countries lined up against it.(Alexander W. Riedel/US State Department via AP)

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Qatari Ministry of Foreign Affairs officials welcome U.S. Secretary of State Rex Tillerson to Doha, Qatar, Tuesday, July 11, 2017. Tillerson arrived in Qatar as he tries to mediate a dispute between the energy-rich country and its Gulf neighbors. The visit is Tillerson's second stop on a shuttle-diplomacy tour that is also expected to take him to Saudi Arabia, which shares Qatar's only land border and is the most powerful of the four countries lined up against it. (Trevor T. McBride/US State Department via AP)

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World Petroleum Congress President Jozsef Toth, right, poses for photographs as he hands the Dewhurst Award to U.S. Secretary of State Rex Tillerson, at the World Petroleum Congress, hosted by Istanbul, Turkey, Sunday, July 9, 2017. Toth, described Tillerson, who is from Texas, as "a man born with oil in his veins". The former ExxonMobile chief expressed his gratitude and said he misses "colleagues, partners and competitors" in the oil industry. (AP Photo)

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U.S. Secretary of State Rex Tillerson gestures as he delivers a speech at the World Petroleum Congress, hosted by Istanbul, Turkey, Sunday, July 9, 2017. Council President Jozsef Toth, who described Tillerson, who is from Texas, as "a man born with oil in his veins" before presenting him with the Dewhurst Award, named after the founder of the congress. The former ExxonMobile chief expressed his gratitude and said he misses "colleagues, partners and competitors" in the oil industry. (AP Photo)

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"Clearly the level of spending that the State Department has been undertaking ... is simply not sustainable," said Secretary of State Rex Tillerson (right). He is to appear at a Senate hearing Tuesday. (Associated Press)

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FILE -- In this Monday, May 8, 2017 file photo, Secretary of State Rex Tillerson, right, walks with Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman bin Jassim Al Thani, at the State Department in Washington. On Monday, June 5, 2017, Bahrain, Egypt, Saudi Arabia and the United Arab Emirates cut diplomatic ties to Qatar, further deepening a rift between Gulf Arab nations over that country's support for Islamist groups. In Sydney, U.S. Secretary of State Rex Tillerson said he didn't believe the diplomatic crisis would affect the war against the Islamic State group in Iraq and Syria. (AP Photo/Jacquelyn Martin, File)

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FILE- In this April 12, 2017, file photo, Secretary of State Rex Tillerson speaks to the media during a news conference with Russian Foreign Minister Sergey Lavrov in Moscow. The “America First” president who vowed to extricate America from onerous overseas commitments appears to be warming up to the view that when it comes to global agreements, a deal’s a deal. The administration says it is reviewing these accords and could still pull out of them. A day after certifying Iran’s compliance with the nuclear deal, Tillerson attacked the accord and listed examples of Iran’s bad behavior. His tone suggested that even if Iran is fulfilling the letter of its nuclear commitments, the deal remains on unsure footing.(AP Photo/Ivan Sekretarev, File)

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Secretary of State Rex Tillerson criticized the Iran nuclear deal. "The Trump administration has no intention of passing the buck," he said Wednesday. (Associated Press)

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U.S. Secretary of State Rex Tillerson steps off his plane at Pisa Military Airport in Pisa, Italy, on Sunday, April 9, 2017. Tillerson is in Italy to attend a meeting of foreign ministers from the Group of 7 industrialized economies. (AP Photo/Josh Lederman)