Dozens of writers and artists have signed an open letter this week imploring President Trump to “rescind” his executive action that bans individuals from seven predominantly Muslim countries from entering the U.S.

“Its restriction is inconsistent with the values of the United States and the freedoms for which it stands,” the letter reads.

Some of the more than 60 notable writers and poets who signed it include Chimamanda Ngozi Adichie, Margaret Atwood, Rita Dove, Jonathan Franzen, Khaled Hosseini, Azar Nafisi and George Packer.

The advocacy group PEN America led the effort, reportedly saying that the travel ban “hindered the free flow of artists and thinkers — and did so at a time when vibrant, open intercultural dialogue is indispensable in the fight against terror and oppression.”

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The letter says artists directly and negatively affected by the ban include Syrian singer Omar Souleyman, the poet Adonis and Iranian director Asghar Farhadi. Farhadi is Oscar-nominated for his film “The Salesman,” but says he is unable to attend the Academy Awards ceremony on Sunday because of the ban.

“Preventing international artists from contributing to American cultural life will not make America safer, and will damage its international prestige and influence,” the letter adds.

The letter also urges Trump to avoid any further measures that “similarly impairs freedom of movement and the global exchange of arts and ideas.”

Packer, however, expressed doubt that the letter will have an impact.

“I don’t expect it to change any minds at the top of the Trump administration, but perhaps it will give heart to officials lower down, and to foreigners who wonder if America is losing what makes it great,” he told The New York Times, which first reported the letter.

PEN America plans to share the letter on social media.