The chairman of the Federal Communications Commission has opened an investigation into NPR and PBS over the public broadcasters’ airing of commercials. Brendan Carr, President Donald Trump’s pick to lead the agency,

Brendan Carr, the President Trump-appointed FCC chairman, warned the CEOs of PBS and NPR that they “could be violating federal law by airing commercials” — and that he has ordered an investigation by the FCC’s Enforcement Bureau into the matter.

The investigation will revolve around NPR and PBC airing sponsorships across their 1,500-plus member stations, FCC Chairman Brendan Carr said.