WWW- Besieged author Ed Klein is preparing to defend his work this week when he hits the promotional circuit for TRUTH ABOUT HILLARY.

Klein’s publisher has upped the book first printing to nearly 350,000 copies, sources tell the DRUDGE REPORT.

[The book ranked #26 on AMAZON.COM’s hourly sale chart late Sunday.]

Klein will sensationally claim Bill Clinton is flagrantly cheating on his senator wife.

“Hillary’s aides noticed that Bill seemed to grow even more reckless after his memoir MY LIFE became a big bestseller. Thanks to his record-shattering $12 million book advance plus another $10 million in speaking fees, he was rolling in money — and hubris,” Klein writes.

“Throwing caution to the wind, he started a torrid affair with a stunning divorcee in her early forties, who lived near the Clintons in Chappaqua. There was nothing discreet about the way he conducted this illicit relationship; he often spent the night at his lover’s home, while his Secret Service agents waited in a car parked at the end of her driveway.”

“It’s one thing to go out to California with his wild buddies and stuff there,’ said someone with intimate knowledge of the former president’s philandering. ‘But being indiscreet with a woman in Chappaqua steps over the line. That’s the place Hillary calls home.'”

The book presents a photo of the former president ‘mouth-kissing’ an unidentfied woman.

As this space reported last week, Hillary turned furious and considered legal action after learning Klein would allege in his new book: Bill Clinton raped her — resulting in the conception of daughter Chelsea Clinton.

“Mrs. Clinton told me she would considering suing him for outright libel,” the top Hillary source explains. “This is the right wing attack machine on crack!”

VANITY FAIR commissioned an excerpt of the embargoed book, exploring Hillary’s senate runs.

Klein is the former foreign editor of NEWSWEEK and former editor in chief of the NEW YORK TIMES MAGAZINE.