Sean Hannity, the highest-paid star on Fox with a contract worth $25 million (£19m) a year, published his fourth book, Live Free or Die, in August.

Forbes reported at the time that the 58-year-old was given a multimillion dollar advance for the book, which publishers Simon & Schuster describe as “a look at America’s fight against those who would reverse our tradition of freedom.”

On Friday Salon reported that the Republican National Committee spent $492,000 on books in one day — likely all of it, they said, on Hannity’s latest.

The 16 September purchase was published under Federal Election Commission filings as “donor mementos”.