NAIROBI, Kenya — Secretary of State Rex Tillerson canceled his scheduled events Saturday in Kenya because he was sick.

“The secretary is not feeling well after a long couple days working on major issues back home such as North Korea,” Undersecretary of State Steve Goldstein said.

By the afternoon, Tillerson had improved and was expected to resume his schedule Sunday.

Goldstein said some events may be rescheduled, including a planned stop at the site of the 1998 bombing of the U.S. Embassy in Nairobi.

An event Saturday for PEPFAR, the U.S. program to fight HIV/AIDS in Africa, went ahead without Tillerson. His visit to the U.S. Embassy to meet with American diplomats was scrapped.

A rigorous schedule that included stops in three African countries Friday has been made even more strenuous for Tillerson by events in Washington. Tillerson was up much of the previous night working the phones when President Trump agreed to a meeting with North Korean leader Kim Jong Un.

Tillerson arrived in Kenya on Friday afternoon for the third stop on his five-country tour of Africa. He had started his day Friday in Ethiopia and flew to Djibouti for a brief visit.