Donald Trump's old catchphrase was "you're fired" - and his senior team has had a very high turnover.
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Rex Tillerson
Anthony Zurcher
North America reporter
After his former secretary of state questions his discipline, the president fires off an insult-laden tweet.
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Defence hawk John Bolton becomes National Security Adviser, in the latest change in the White House.
Read moreIn a speech to state department employees, outgoing Secretary of State Rex Tillerson advised staff to perform one act of kindness each day.
Barbara Plett Usher
BBC State Dept correspondent, Washington
After Tillerson's quick exit - who will be part of high-stakes talks with North Korea?
Read moreThe new man running US foreign policy
Mike Pompeo is likely to take a tougher line on North Korea and Iran, says Barbara Plett-Usher in Washington. (Picture: Mike Pompeo. Credit: Reuters)
BBC Monitoring
The world through its media
Rex Tillerson's sacking as US state secretary has many believing the US will now negotiate more harshly.
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Joel Gunter
BBC News
A look at key foreign issues on which new Secretary of State Mike Pompeo might sway President Trump.
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The secretary of state fired by Mr Trump warns of Russia's "troubling behaviour" as a parting shot.
Read moreRex Tillerson's adviser also had no idea his boss faced the axe judging by what he told the BBC last week.