Jake Tapper, the co-author of an explosive book claiming the White House covered up Joe Biden’s cognitive decline, is haemorrhaging viewers on his CNN show, it has been claimed.

Media analysts attributed the apparent decline to the relentless hawking of his book Original Sin by Mr Tapper and Alex Thompson of Axios.

According to the Nielsen Ratings, The Lead, Mr Tapper’s daily show averaged 525,000 viewers from April 28 to May 5, representing a 25 per cent drop on the same period last year.

“Tapper is saying in his new book, we saw what was going on, but we didn’t tell you,” Andrew Selepak, media professor at Florida University, told The Telegraph.

“Well, that kind of blows up any credibility. And if you’re looking at a news host to get news from, they basically are now telling you I wasn’t really giving you the news.”

“There’s not a lot of interest in consuming that content,” he added.

“That lack of credibility makes you go, why should I continue to consume you? If I’m not going to get the truth from you, I might as well watch Netflix.”