Pro-life groups are suing D.C. Mayor Muriel Bowser over the arrests of advocates who wrote “Black Preborn Lives Matter” in chalk on the sidewalk.

The Alliance Defending Freedom filed a lawsuit this week on behalf of the Frederick Douglass Foundation and Students for Life accusing Bowser and the District of Columbia following the August arrests of two Students for Life members.

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“The Plaintiffs were prohibited from communicating their message, even though other messages are now permanently emblazoned along the streets of the District in a nearly identical format,” the lawsuit said. “The only difference between the Plaintiffs’ desired mural and the other permitted—and permanent—murals is the content of the message.”

The Metropolitan Police Department arrested both 29-year-old Warner DePriest and 22-year-old Erica Caporaletti on an early August Saturday morning for chalking pro-life sentiments, including the slogan “Black Preborn Lives Matter,” on the road in front of a Planned Parenthood abortion clinic.

“City officials were not content to stop a message in temporary paint,” Students for Life of America President Kristan Hawkins said in a statement.

“Two students were arrested trying to express in chalk what they were not allowed to say in paint,” she continued. “That kind of viewpoint discrimination cannot be allowed to continue unchallenged.”

The arrests came after Bowser commissioned the “Black Lives Matter” slogan to be painted on the streets of D.C. earlier this summer. The mural included the symbol of the D.C. flag—two horizontal bars topped by three stars—after which activists painted “Defund the Police,” making the phrase appear “Black Lives Matter = Defund the Police.”

Bowser’s government removed the D.C. flag but allowed “Defund the Police” to remain, The Washington Post reported.

“The government can’t discriminate against certain viewpoints by allowing some voices to be heard while silencing others,” Elissa Graves, Alliance Defending Freedom legal counsel, said in a statement.

She continued: “Because of the city’s actions, Frederick Douglass Foundation and Students for Life of America weren’t able to participate in the public square as other groups have. The First Amendment prohibits the government from picking and choosing whose speech to allow.”

Bowser’s office did not immediately respond to a request for comment from The Daily Caller News Foundation.

Attorney Harmeet Kaur Dhillon, who is the CEO of the Center for American Liberty, previously told The Daily Caller News Foundation that the disparity in treatment in these cases is “obviously viewpoint discrimination.”

“I think it’s going to become clear as legal proceedings, which are probably inevitable, proceed on this matter that the city and it’s law enforcement have violated clearly established First Amendment precedent that bars treating similarly situated circumstances of free speech differently,” Dhillon told The Daily Caller News Foundation in August.

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