The head of the Federal Communications Commission informed NPR and PBS on Wednesday that the agency will probe whether messages aired by the taxpayer-funded broadcasters “cross the line into prohibited commercial advertisements.

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,

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