Despite a book tour for "Original Sin," Jake Tapper's CNN show sees its lowest ratings since 2015, with a significant drop in the key 25-54 age demographic.

Biden supporters have argued that Tapper’s book serves only as a distraction from President Donald Trump’s unprecedented administration. The book has also drawn criticism from conservatives and Biden critics, who say Tapper failed to address concerns about Biden while he was in office.

A book the CNN host co-wrote has received positive reviews and appears to be a sales hit. But it has also generated intense scrutiny of him and his work.