US President Donald Trump has sacked Secretary of State Rex Tillerson, replacing him with the director of the CIA, Mike Pompeo.
Thanking Mr Tillerson for his service on Twitter, Mr Trump said the new state secretary would do “a fantastic job”.
Mr Tillerson, a former chief executive of ExxonMobil, was only appointed to the job just over a year ago.
The president also nominated Gina Haspel to become the first woman director of the CIA.
A senior White House official told the BBC about the timing of the announcement: “The president wanted to make sure to have his new team in place in advance of the upcoming talks with North Korea and various ongoing trade negotiations.”
Mr Tillerson was on an official tour of Africa last week when he was apparently caught unawares by Mr Trump’s announcement that he would hold talks with North Korean leader Kim Jong-un.
The top US diplomat’s team said he was feeling unwell on Saturday and later in the weekend the state department said he would cut short his tour by a day.
Reports have swirled of a schism in the Trump administration between the commander-in-chief and his top diplomat, as the US faces a host of vexatious foreign policy conundrums, from North Korea to Iran.
Last October Mr Tillerson was forced to convene a news conference to deny reports that he was considering quitting, though he did not comment on a report that he had called his boss a moron after a meeting last July at the Pentagon.