Gavin Williamson has been removed as education secretary as the prime minister carries out a reshuffle of his cabinet ministers.
In a Twitter post, Mr Williamson said: "It has been a privilege to serve as education secretary since 2019.
"Despite the challenges of the global pandemic, I'm particularly proud of the transformational reforms I've led in post-16 education: in further education colleges, our skills agenda, apprenticeships and more."
He added he would "look forward to continue to support the prime minister and the government".
Mr Williamson has faced regular criticism of his handling of the education brief during the COVID-19 crisis, including over the pandemic-enforced shutting of schools and a fiasco over the awarding of A-level and GCSE grades.
Last week, Mr Williamson was widely mocked after he admitted to confusing England footballer Marcus Rashford with rugby star Maro Itoje.
The prime minister is expected to complete the reshuffle of his cabinet today, with changes to lower ministerial ranks to be finalised on Thursday.
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Confirmation that Mr Johnson would hold a widely-anticipated reshuffle of his ministers came during Wednesday's session of Prime Minister's Questions.
A Number 10 source said Mr Johnson would look to “put in place a strong and united team” to help the country recover from the COVID pandemic.
They also said the prime minister was looking for his government to “redouble our efforts to deliver on the people’s priorities” and Mr Johnson would appoint ministers “with a focus on uniting and levelling up the whole country”.
At a briefing for Westminster journalists, the prime minister's official spokesman said Mr Johnson had not consulted his wife Carrie on the reshuffle.
Earlier in the day, Mr Johnson's former chief adviser Dominic Cummings had branded the imminent moving of ministers as the "Carrie Reshuffle".