John Brennan John Brennan

Former CIA Director John Brennan at a congressional hearing in 2017. President Trump revoked Brennan's security clearance, claiming he was "erratic." Brennan has been one of Trump's harshest critics in the national security community. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Former CIA Director John Brennan and other former top national security officials could lose their security clearance if the White House follows through on a threat made Monday. Claire Harbage/NPR hide caption

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Claire Harbage/NPR

Since stepping down as CIA chief last year, John Brennan has been a harsh critic of President Trump. "I just think he hasn't fulfilled the responsibilities of the president of the United States," Brennan tells NPR. Claire Harbage/NPR hide caption

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Claire Harbage/NPR

Free To Speak, Ex-CIA Chief John Brennan Takes On Trump

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From left, National Security Agency Director Adm. Mike Rogers, former FBI Director James Comey, former Director of National Intelligence James Clapper, ex-CIA Director John Brennan, and Defense Intelligence Agency Director Lt. Gen. Vincent Stewart participate in the Senate intelligence committee's hearing on worldwide threats last year. Alex Brandon/AP hide caption

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Alex Brandon/AP

CIA Director John Brennan discussed ISIS, the FBI-Apple dispute over an iPhone, the state of the Iran nuclear deal, and his future plans as President Obama's term draws to a close. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

Listen To Part 1 On 'Morning Edition'

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CIA Director John Brennan listens during a news conference at CIA headquarters in Langley, Va., in December 2014. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

Sen. Dianne Feinstein speaks to reporters after speaking about her oversight committee's problematic relationship with the CIA Tuesday. CIA Director John Brennan says his agency isn't trying to delay the panel's report on the U.S. interrogation program. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

John Brennan, President Obama's nominee to head the CIA, prepares to testify at his confirmation hearing before the Senate Intelligence Committee on Thursday. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

John Brennan, President Obama's nominee to be the next CIA director, worked closely with Saudi Arabia to set up a secret U.S. drone base there, The New York Times reported. Brennan's confirmation hearing is Thursday. Kevin Dietsch /UPI /Landov hide caption

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Kevin Dietsch /UPI /Landov

The nominees: John Brennan (left), who is President Obama's choice to head the CIA; and former Sen. Chuck Hagel, R-Neb., who the president has asked to be secretary of defense. STAFF/Reuters /Landov hide caption

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STAFF/Reuters /Landov

NPR coverage of the Hagel/Brennan nomination announcements

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John Brennan, who President Obama wants to lead the CIA. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

John Brennan at the White House on Monday (May 2, 2011). Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

Steve Inskeep speaks with John Brennan

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