The British Broadcasting Corporation on Tuesday apologized for a radio interview broadcast last Friday that was presented as one with Sen. Cory Booker (D-New Jersey) — but turned out to be an impostor who pulled off a “deliberate hoax.”

“In our Newshour radio programme on Friday, a man claiming to be Senator Cory Booker was interviewed in what appears to be a deliberate hoax,” the network said in a statement. “We have apologised to Senator Booker and are looking into what went wrong to make sure it doesn’t happen again.”

The statement went on, “The interview only aired once at 2000 GMT on Newshour on Friday 26 February and has not appeared elsewhere.”