rex tillerson

President Trump and North Korean leader Kim Jong Un are expected to continue to square off in 2018. Evan Vucci, Wong Maye-E/AP hide caption

Secretary of State Rex Tillerson could be replaced by CIA Director Mike Pompeo in as soon as a few weeks, according to multiple media reports. Mandel Ngan/AFP/Getty Images hide caption

Secretary of State Rex Tillerson, with Secretary of Defense Jim Mattis, testifies during a Senate Foreign Relations Committee hearing on Congress's power to authorize the use of military force. Manuel Balce Ceneta/AP hide caption

Secretary of State Rex Tillerson met with Indian Prime Minister Narendra Modi in New Delhi on Oct. 25. Alex Brandon/AFP/Getty Images hide caption

U.S. Secretary of State Rex Tillerson steps off the plane as he arrives in Qatar after returning from Bagram Air Base in Afghanistan on Monday. Tillerson paid a surprise visit to Afghanistan to meet with President Ashraf Ghani and other officials. Alex Brandon/AFP/Getty Images hide caption

Mission San Jose, one of five missions in San Antonio designated by UNESCO as a World Heritage Site. The cultural aid agency has designated more than 1,000 such sites around the world — including more than 20 in the U.S. — to celebrate their "outstanding universal value." Eric Gay/AP hide caption

Secretary of State Rex Tillerson said at a briefing Wednesday that a news report that he intended to resign was "intended to divide" and that he was "not going to deal with petty nonsense." Jim Watson/AFP/Getty Images hide caption

President Trump in Morristown, N.J., in September and Kim Jong Un following a military parade in Pyongyang earlier this year. Mandel Ngan/AFP/Getty Images hide caption

The State Department is suspending visa services at the U.S. Embassy in Havana indefinitely. Desmond Boylan/AP hide caption

Secretary of State Rex Tillerson says North Korea's Kim Jong Un "doesn't seem to understand diplomatic language." Vincent Thian/AP hide caption

South Korean army soldiers patrol on Monday along the barbed-wire fence in Paju, near the border with North Korea. Ahn Young-joon/AP hide caption

Tourists bow before statues of late North Korean leaders Kim Il-Sung (left) and Kim Jong-Il, in Pyongyang last month. The U.S. will ban travel to North Korea starting Sept. 1. Ed Jones/AFP/Getty Images hide caption

Secretary of State Rex Tillerson, photographed by NPR in the George C. Marshall room at the State Department in April. Ariel Zambelich/NPR hide caption

President Trump and Russian President Vladimir Putin at the G-20 Summit on Friday. Shortly after they met, the United States said the two countries had agreed to a cease-fire in southwestern Syria. Evan Vucci/AP hide caption