US President Donald Trump has fired Secretary of State Rex Tillerson.
The new development comes after Tillerson concluded his 3-day visit to Kenya.
Tillerson travelled back to the United States on Monday morning from Kenya after concluding his African tour.
Trump replaced him with CIA Director Mike Pompeo.
While in Kenya, Tillerson held talks with President Uhuru Kenyatta and Foreign Affairs CS Monica Juma.
On Saturday, Tillerson cancelled all his activities of the day after falling sick.
It is not clear why Trump fired Mr. Tillerson even though recent media reports indicated that the relationship between the two was strained.
According to the Indepedent, the reports have been denied by both the White House and the State Department.
Mr Trump had suggested last week that more changes were coming at the White House.
"Mike Pompeo, Director of the CIA, will become our new Secretary of State. He will do a fantastic job! Thank you to Rex Tillerson for his service! Gina Haspel will become the new Director of the CIA, and the first woman so chosen. Congratulations to all!" Trump tweeted.