Jerome Corsi, author and investigative writer, has been served papers to appear before the Mueller grand jury in Washington this Friday to answer questions about his longtime Trump confidante Roger Stone, according to a report in The New York Times.

Corsi is the author of “Killing the Deep State: The Fight to Save President Trump,” a New York Times bestselling book that has been harshly criticial of the probe of special counsel Robert Mueller.

“He fully intends to comply with the subpoena,” Corsi’s lawyer David Gray told the Times, adding that his client anticipated “it has to do with his communications with Roger Stone.”

Corsi’s “Killing the Deep State” was published last February and has been the #1 bestselling conservative critique of the Mueller investigation. [Editor’s Note: Get Jerome Corsi’s “Killing the Deep State” at bookstores everywhere or get the FREE Offer – Go Here Now ]

A mainstay on talk radio and TV shows, including Newsmax TV, Corsi has claimed Mueller has overreached his legal authority. Corsi has stated that President Trump’s recent tweet that a “criminal deep state” is seeking to end his presidency emanated from evidence and charges he makes in his new book.

In an August appearance on Newsmax TV, Corsi lambasted the Mueller probe for its "unequal justice" in prosecuting former Trump campaign manager Paul Manafort.

"It raises the question of unequal justice because [lobbyist] Tony Podesta was involved in virtually the same contracts as Paul Manafort in Ukraine,” Corsi said.

Corsi is one of close to a dozen Stone associates to be called before the grand jury.

Stone, a long-time political adviser to Donald Trump, has claimed publicly he will likely be indicted, but not on any charges relating to his contacts with WikiLeaks or Russians during the 2016 campaign.

One source suggests Mueller will be probing to see if Corsi served as an intermediary between Stone and foreign contacts.

Federal investigators in March detained and questioned informal ex-Trump campaign adviser Ted Malloch about Stone and WikiLeaks.

In August former Manhattan madam Kristin Davis gave grand jury testimony in Washington, D.C., on her business dealings with Stone.

Another close Stone associate, political operative Andrew Miller, was held in contempt by a judge for refusing to appear.

Mueller has zeroed in on Stone for his communications with WikiLeaks and hacker Guccifer 2.0 ahead of WikiLeaks’ release of stolen emails from Clinton campaign chair John Podesta.

Rumors swirled over the weekend that Stone would be indicted in the Russia probe.

“The only thing I’m guilty of is supporting Donald Trump for president and being effective against Hillary Clinton,” Stone told the Boston Herald last Friday.

“I can assure you,” Stone said, “the special counsel has no evidence against me of Russian collusion or of WikiLeaks intrusion or that I knew about the release of John Podesta’s emails.”

Corsi’s book has sparked serious interest among Trump’s most loyal supporters. And TV host Bill O’Reilly has stated that the left “hates” Corsi’s book because of its strong defense of President Trump.

Editor’s Note: Get Jerome Corsi’s “Killing the Deep State” at bookstores everywhere or get the FREE Offer – Go Here Now