Aaron Klein

Netanyahu appointed Klein as campaign manager and chief of his March 2021 election campaign. "Klein is one of the most talented strategists we ever worked with and he is tirelessly dedicated to safeguarding the State of Israel," Jonatan Urich, a Likud party spokesman, said. Klein served as strategic advisor to Netanyahu during the 2022 election, in which Netanyahu won a decisive victory.

In June 2020, Netanyahu hired Klein as a full-time strategic advisor. "Klein left a full-time successful career as a reporter to help as Israel finds itself facing unprecedented challenges during the coronavirus pandemic, amid the international debate on the issue of applying sovereignty [in the West Bank] and other pressing matters," the Likud stated.

In 2019, Klein advised Israeli Prime Minister Netanyahu while the premier was preparing a public campaign against the Israeli attorney general's decision to indict him. Klein was chief strategist for Netanyahu's December 2019 Likud primary in which Netanyahu scored a landslide victory. Klein then served as chief strategist for Netanyahu's third successive general election after two previous elections failed to produce a clear majority government. Netanyahu's Likud party won more votes than any party in Israeli electoral history, with Likud crediting Klein's strategy for historic turnout from its voters. At his campaign's nationally televised "victory" event, Netanyahu publicly credited Klein with his victory in the March 2020 election, which produced a unity government in which Netanyahu would serve as prime minister for 18 months.

He played a role in Donald Trump’s 2016 presidential campaign.

Steve Bannon, chief strategist for Donald Trump's 2016 presidential campaign, credited Klein with being the “genius” who came up with the idea of bringing Clinton's female accusers to the St. Louis presidential debate in October 2016. The debate took place as Trump was facing mounting pressure to step down following the release of the "Access Hollywood" tape in which Trump was caught on camera making controversial statements about women. Klein's strategy to bring Bill Clinton's accusers to the debate and sit them in the front row across from Bill Clinton and facing Hillary Clinton on stage was widely reported as helping to turn Trump's campaign around at that time and regain the narrative.

During the 2016 U.S. presidential election, Klein conducted a series of interviews with the sexual assault accusers of Bill Clinton: Juanita Broaddrick, Gennifer Flowers, Paula Jones and Kathleen Willey. The allegations become fodder for the presidential debates and the news cycle. Hours before the third presidential debate, former Arkansas television reporter Leslie Millwee gave her first public interview with Klein at Breitbart News, claiming Clinton sexually assaulted her in 1980.

Maggie Haberman reported in Politico that the book was part of a resurgence of conservative book publishing targeting Clinton in the run-up to the United States presidential election in 2016. Alex Seitz-Wald, writing for MSNBC, said the book would prove "easy fodder for the conservative echo chamber".

Klein hosted a weekly radio program, Aaron Klein Investigative Radio on Salem Media Group-owned conservative talk stations, WNYM in the New York City area and WNTP in Philadelphia. The program previously aired on WABC in New York until early 2014. His show included his calling and interviewing terrorists on the air. "Aaron Klein Investigative Radio" annually made Talker's "Heavy Hundred" list of top American weekend radio programs, considered the standard for talk radio ratings. His program was one of two weekend programs in the U.S. that made the list most years. The show was reported to have over one million weekly listeners. In January 2013, the show claimed it was the most-listened-to AM talk show radio on the weekend.

On September 11, 2014, the second anniversary of the Benghazi attacks, Klein released a new book entitled, The REAL Benghazi Story: What the White House and Hillary Don’t Want You to Know.

In August 2013, Klein published Impeachable Offenses: The Case to Remove Barack Obama from Office. MSNBC reported the book fueled the national conversation to impeach Obama, while BuzzFeed announced the book “ushers in the Obama impeachment movement” on the right.

Fool Me Twice: Obama's Shocking Plans for the Next Four Years Exposed was released on August 7, 2012, and appeared on The New York Times bestseller list the following week.

Red Army: The Radical Network That Must Be Defeated to Save America was published in October 2011. The book was reviewed by Michael Tomasky for the New York Review of Books, writing "I can't in good conscience recommend that anyone read 'Red Army' except perhaps the president," noting that the book "will be read by hundreds of thousands."

In June 2010, Imam Faisal Abdul Rauf, the Muslim leader behind a proposed Islamic cultural center near the site of the 9-11 attacks, was interviewed by Klein on WABC, where he reportedly refused to describe Hamas as a terrorist organization.

On August 15, 2010, Mahmoud al-Zahar, the chief of Hamas in Gaza, appeared on Klein's program, where he expressed support for Park51 community center. Zahar's comments made the cover of the New York Post and generated world media attention.

The Manchurian President: Barack Obama's Ties to Communists, Socialists and Other Anti-American Extremists was released in May 2010. In the book (per The New York Times blurb), "President Obama's life and campaigns are sifted for Communist and socialist ties." The book was on the New York Times' bestseller list for hardcover nonfiction as well as those of Publishers Weekly and The Washington Post. Simon Maloy, writing for Media Matters for America, and John Oswald, of the New York Daily News, both called the book "ridiculous crap". Some journalists, including from publications such as Time and Newsweek, sent emails to the author's publicist saying they did not want to receive a review copy of Klein's book.

In March 2009, Klein criticized Wikipedia for what he described as preferential treatment of Barack Obama coverage. Klein said that Wikipedia editors had scrubbed the article of material critical of the president and that an editor had been suspended for attempting to add "missing" details about Obama's relationship with Bill Ayers and allegations that Obama was not born in the United States. Klein said similar negative content was found in the article of George W. Bush.

In April 2008, Klein appeared on the John Batchelor radio show, where both interviewed Ahmed Yousef, chief political adviser to Hamas in the Gaza Strip. During that interview, Yousef stated that Hamas endorsed Barack Obama for president. The interview became a theme of the 2008 presidential campaign. Republican candidate John McCain and Obama themselves addressed Yousef's comments; McCain quoted Yousef's comments dozens of times during media interviews.

During a June 2007 interview, after an argument during a radio interview over whether or not Hamas was a terrorist organization, British politician George Galloway evicted Klein from his office and turned him over to Parliament police, claiming he had breached security by falsely presenting himself as a reporter and that Klein was really a "Zionist agent".

Klein's book Schmoozing with Terrorists: From Hollywood to the Holy Land, Jihadists Reveal their Global Plans – to a Jew! was released in September 2007.

Aaron Klein (Hebrew: אהרון קליין; born 1979) is an American-Israeli conservative political commentator, journalist, strategist, bestselling author, and senior advisor to Prime Minister Benjamin Netanyahu. He served as campaign manager for Netanyahu's election campaign for the March 2021 election and as chief strategist for Netanyahu's successful 2020 election campaign. Klein was Netanyahu's full-time chief strategist from 2020 to 2021, during the entire period Netanyahu was prime minister of Israel's 36th government.