Rex Tillerson is the latest member of US President Donald Trump's staff to be removed or leave their role since he took office last year.
Secretary of State Rex Tillerson was fired after a series of public rifts over policy on North Korea, Russia and Iran.
Mr Tillerson will be replaced with CIA Director Mike Pompeo.
The biggest shakeup of Mr Trump's cabinet since he took office in January 2017 was announced by the president on Twitter today.
Here are some of the other top-level people who have either been fired or resigned from the Trump administration:
Chief strategist Steve Bannon was fired in August 2017.
The move ended the turbulent tenure of a rabble-rousing conservative media entrepreneur and political activist who was a favourite of Mr Trump's base.
Mr Bannon is widely credited with masterminding much of Mr Trump's election campaign.
The former Lieutenant General was appointed as national security adviser by Mr Trump last January.
He was forced to resign from the job in February 2017 for failing to disclose the content of his talks with Sergei Kislyak, Russia's ambassador to the United States, and then misleading Vice President Mike Pence about the conversations.
The FBI director was handling an investigation into links between Mr Trump's election campaign and Russia.
He was removed from the role - which is usually held for a ten-year term - by Mr Trump in May 2017, creating a firestorm in Washington.
The White House first claimed that he was fired due to his handling of an investigation into Democratic candidate Hillary Clinton's use of a private email server, but Mr Trump then admitted it was due to the Russian probe.
At a congressional hearing in June, Mr Comey testified that he was fired for trying to undermine the Russian investigation.
The much-maligned White House press secretary resigned from his role in July 2017, ending a turbulent tenure.
The White House gave no reason for his resignation at the time, although media reports suggested it was due to Anthony Scaramucci's appointment as communications director.
Mr Spicer had been serving as both press secretary and communications director since Mike Dubke resigned as communications director in May.
He was replaced as Press Secretary by Sarah Huckabee Sanders, while Mr Scaramucci served as communications director briefly.
White House chief of staff Reince Priebus was replaced by former Marine Corp general John Kelly just a week after Mr Spicer's resignation.
He told CNN that he resigned on Thursday 27 July, with Mr Trump announcing that Mr Kelly would replace him via Twitter the following day.
His tenure as chief of staff came to an end during a feud with Mr Scaramucci.
The recently-appointed communications director had launched a foul-mouthed attack on Mr Priebus and Mr Bannon during a phone call to a journalist with the New Yorker magazine.
After an extremely turbulent ten days, Mr Scaramucci was removed from his role as communications director.
He had been sworn in the previous day.
In a statement, the White House said he was removed in order to give Mr Kelly a "clean slate" as Chief of Staff.
His term is best remembered for the unprompted, foul-mouthed rant to a journalist about several of his colleagues.
Top White House economic adviser Gary Cohn announced his resignation last week.
The Wall Street banker opposes hefty steel and aluminum tariffs planned by Mr Trump.
His departure as director of the National Economic Council came after a little more than a year in the job.
Following the news of Mr Cohn's departure, the US dollar weakened, while an exchange-traded fund tracking the broad market S&P 500 dipped 1%.
Hope Hicks resigned from her job as White House communications director in February 2018.
Ms Hicks was one of Mr Trump's longest-serving aides.
White House spokesperson Sarah Sanders said that the departure was not related to Ms Hicks' testimony to a congressional committee about a probe into Russian meddling in the 2016 presidential election.
Mr Trump's embattled health minister Tom Price was forced to leave the US administration last September, amid a scandal over his use of costly private jets for government travel.
In all, Mr Price has flown on 26 separate trips last year on private aircraft, totaling some $400,000, according to Politico.
He had tried to put a lid on the scandal by paying back what turned out to be a fraction of the cash spent.
A number of other members of the Trump administration have also left since he was sworn into office last January. These include:
- Walter Shaub, who resigned as director of the Office of Government Ethics
- Sally Yates, who was removed from her role as attorney general just ten days into the Trump administration
- Katie Walsh, who resigned as deputy chief of staff just nine weeks into her term.