An NPR interview with the organizer of last year’s white supremacist rally in Charlottesville, Va., ignited complaints on Friday about how news organizations cover white nationalism.

In a “Morning Edition” segment, the radio host Noel King interviewed Jason Kessler, a white nationalist who is planning a rally in Washington this weekend on the anniversary of last year’s rally, which was the scene of racist chants and deadly violence.

Ms. King preceded the discussion, which was part of a weeklong series about the anniversary of the Charlottesville rally, with a warning: “Some of what you’re about to hear is racist and offensive.”

She was correct. In the interview on Friday, which lasted about five minutes, Mr. Kessler relayed junk science and ranked the intelligence of various races.