Jeff Bezos, the owner of The Washington Post, has said the newspaper's opinion section will write "every day in support and defence of… personal liberties and free markets" - appearing to align the paper with the US political right.
The newspaper lost 250,000 subscribers after Mr Bezos blocked the endorsement of Ms Harris, with several employees resigning over Mr Bezos's direction in recent months.
Jeff Stein, chief economics reporter at the Post, wrote on X after the email was published: "Massive encroachment by Bezos into The Washington Post's opinion section - makes clear dissenting views will not be published.
The day after the election, Mr Bezos congratulated Trump "on an extraordinary political comeback and decisive victory", while Amazon was among the companies that donated $1m to Trump's inauguration fund in what critics say is an effort to curry favour with the president.
Mr Bezos said: "There was a time when a newspaper, especially one that was a local monopoly, might have seen it as a service to bring to the reader's doorstep every morning a broad-based opinion section that sought to cover all views.
