open letter

plural open letters

1. A letter addressed to one person, or more, but published (as for example in a newspaper) for the public to read.

   More than 60 rail supply business leaders signed an open letter to Rishi Sunak on May 9 urging him to bring forward the bill which would formally establish GBR.

   2023 May 31, Tammy Samuel, Fergus McLaverty, “The political picture: what lies ahead for Britain's railways?”, in RAIL, number 984, page 30

   1 more example

   For months, Dati warned she would refuse to stand aside. Now she has stunned the political class with an open letter to Fillon in Le Monde, a scathing character assassination accusing him of the "lone ambition" of a disillusioned political elite, of doing politics in a way that "never favoured women" and stopping ethnic-minority candidates from progressing at elections. She said he was committing "a sad mistake" in trying to run in Paris.

   2011 December 14, Angelique Chrisafis, “Rachida Dati accuses French PM of sexism and elitism”, in Guardian