Rex Tillerson, the U.S. Secretary of State scheduled to hold talks with President Muhammadu Buhari on Tuesday, has adjusted his itinerary. Tillerson was initially billed to arrive Nigeria on Monday, after which he is expected to hold talks with President Buhari on Tuesday. However, the plan has been changed and Tillerson will now meet Buhari on Monday. Steve Goldstein, Undersecretary of State for Public Diplomacy and Public Affairs, told reporters in Kenya that Tillerson had cut short his tour of African countries to attend to urgent matters in Washington. The five-nation trip to Africa has coincided with two major foreign-policy events: President Donald Trump’s decision to impose tariffs on steel and aluminum imports, and the dramatic announcement on Thursday that the president would meet with North Korean leader Kim Jong Un in May. Tillerson, 65, fell ill while in Kenya and had to cancel planned events in Nairobi on Saturday. The secretary had gone two days without sleep while working on North Korea and other issues, Goldstein said March 10.