Washington: Bill Clinton has a blonde mistress who has been to his house so many times that his secret service protectors have given her a nickname, a book claims.

The Energizer, as the agents refer the buxom woman, is allegedly driven to his £1.1 million (Dh6.8 million) country home as soon as his wife Hillary leaves, in an elaborate manoeuvre that ensures they never meet.

Remarkably, Mrs Clinton’s own security team is also claimed to be involved in the duplicity.

The former US President is said to have ordered his guards not to ask his mistress any questions and “just let her go in”, according to the book.

The claims are the latest in a series of lurid allegations against the Clintons ahead of a potential run for the presidency by Mrs Clinton in 2016 — and have put Mr Clinton’s chequered record with women back on the political agenda.

While in office he survived impeachment proceedings after admitting an affair with former White House intern Monica Lewinsky — and had long being accused of having a wandering eye.

The claims about “the Energizer” are in a book by veteran US author and journalist Ronald Kessler called The First Family Detail: Secret Service Agents Reveal the Hidden Lives of Presidents.

Kessler, who two years ago broke the scandal that agents working for President Obama used prostitutes while on official business in Colombia, has accumulated anecdotes from secret service agents who have been assigned to protect the families of US presidents.

His latest book, to be published next month but reported in the US press yesterday, claims that the woman regularly visits Mr Clinton, 67, at the five-bedroom Dutch colonial mansion in Chappaqua, upstate New York, that he shares with his wife.

Kessler writes that the normal security rules to not apply when the mistress arrives. Instead, the minders have been told: “You don’t stop her, you don’t approach her, you just let her go in.”

Mr Clinton’s security detail coordinate with Mrs Clinton’s team to ensure that the wife and the mistress do not see each other coming or going, it is claimed.

The Energizer — who is not named — is said to be “charming and friendly” and sometimes brings cookies for the agents who ferry her around.

The only time the arrangements went awry was one day when the warning that Mrs Clinton was returning came too late.

Mr Kessler writes: “The agents had to scramble to get Energizer out of there so there wasn’t some kind of big confrontation.”

He claims that Mrs Clinton, 66, is deeply unpopular with secret service agents. The book says: “Because she is so nasty to agents and hostile to law enforcement officers and military officers in general, agents consider being assigned to her detail a form of punishment.”

The book is the third in as many weeks to make allegations about the Clintons’ private lives.

Ed Klein’s Blood Feud made extraordinary allegations that First Lady Michelle Obama hates Mrs Clinton so much she has nicknamed her the “Hildebeast”. Clinton Inc: The Audacious Rebuilding of a Political Machine by Daniel Halper has alleged that Israeli, British and Russian intelligence officers managed to obtain recordings of Mr Clinton and Miss Lewinksy having phone sex.

Kessler has written 20 books about the Secret Service, the FBI and the CIA and is a regular contributor to the Washington Post.

Nobody for Mr or Mrs Clinton was available for comment.