Dozens of literary and media luminaries — from Margaret Atwood, Jay McInerney, Martin Amis and Judy Blume, to Robert Caro, Kurt Andersen, Jill Lepore and Janet Malcolm — are calling on the presidential candidates to “uphold freedom of the press and end intimidation toward journalists” at their nominating conventions these next two weeks.

The writers are among more than 20,000 people, as of Friday morning, who have signed a petition that PEN America, the century-old literary and free expression organization, will deliver on Monday to the Trump and Clinton campaigns, as well as to the Republican and Democratic national committees. Other organizations and media outlets, including The Nation, the Committee to Protect Journalists, Reporters Without Borders and The Intercept, partnered with PEN to collect signatures.

“I think our members and partners are growing increasingly concerned with a climate of hostility toward the press in the context of the campaigns, and tactics that risk curbing press freedoms,” PEN America executive director Suzanne Nossel told POLITICO. She cited recent episodes of “threats directed at journalists” and “remarks about the tightening of libel and defamation laws.”

While Nossel did not refer to candidates by name, those particular examples do seem to have “Donald Trump” written all over them. Additionally, the presumptive GOP nominee has banned news outlets (including POLITICO) from campaign events and mocked individual journalists during public appearances.

But Clinton isn’t exactly the Fourth Estate’s best friend, either. She has a history of stand-offish relations with the press, and in this election cycle in particular, reporters have complained about a lack of access, especially when it comes to official press conferences.

“Throughout the world, writers and journalists play a vital role in upholding democracy and ensuring the public’s right to information,” the petition reads. “But during this year’s presidential campaign we have seen candidates and their supporters launch vicious insults and threats at journalists—excluding reporters and media outlets from access to campaigns, making hostile remarks and gestures toward individual journalists, and showing indifference toward harassment from supporters.”

Other distinguished signatories include (in no particular order): Jacob Weisberg; George Saunders; Sam Lipsyte; Jonathan Lethem; Jennifer Egan; Paul Auster; Siddhartha Deb; Deborah Solomon; Paul Muldoon; Philip Gourevitch; Larissa MacFarquhar; and Kwame Anthony Appiah.

PEN isn’t the only organization making waves around this issue. The White House Correspondents Association, in a USA Today column written by its incoming and outgoing presidents, said it’s “alarmed by the treatment of the press” in this year’s campaign cycle.

“The public’s right to know is infringed if certain reporters are banned from a candidate’s events because the candidate doesn’t like a story they have written or broadcast. … Similarly, refusing to regularly answer questions from reporters in a press conference. … deprives the American people of hearing from their potential commander-in-chief in a format that is critical to ensuring he or she is accountable for policy positions and official acts.”