WASHINGTON — National Public Radio and three local stations filed a lawsuit Tuesday against President Donald Trump, arguing that an executive order aimed at cutting federal funding for the organization is illegal.

The lawsuit, filed in federal court in Washington by NPR, Colorado Public Radio, Aspen Public Radio and KUTE, Inc. argues that Trump’s executive order to slash public subsidies to PBS and NPR violates the First Amendment.

Trump issued the executive order earlier this month that instructs the Corporation for Public Broadcasting and other federal agencies “to cease Federal funding for NPR and PBS” and requires that they work to root out indirect sources of public financing for the news organizations. Trump issued the order after alleging there is “bias” in the broadcasters’ reporting.

“The Order’s objectives could not be clearer: the Order aims to punish NPR for the content of news and other programming the President dislikes and chill the free exercise of First Amendment rights by NPR and individual public radio stations across the country,” the lawsuit alleges.

“The Order is textbook retaliation and viewpoint-based discrimination in violation of the First Amendment, and it interferes with NPR’s and the Local Member Stations’ freedom of expressive association and editorial discretion,” it said.