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WASHINGTON, DC - JULY 01: President Donald Trump's lawyer and former New York City Mayor Rudy Giuliani talks to journalists outside the White House West Wing July 01, 2020 in Washington, DC. Giuliani did an on-camera interview with One America News Network's Chanel Rion before talking to other journalists about Vice President Joe Biden and the news that Russian intelligence may have paid Taliban operatives to kill U.S. troops in Afghanistan. (Photo by Chip Somodevilla/Getty Images)
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(CNN Business) —  

A conservancy group denounced Fox News host Tucker Carlson on Monday for claiming that immigrants make the Potomac River “dirtier.”

“There’s a time to speak truth against ignorance and to stand up for our values – and that time is now,” Hedrick Belin, president of the Potomac Conservancy, said in a statement.