David Petraeus, Chairman, KKR Global Institute speaks at the Milken Institute 21st Global Conference in Beverly Hills, California, U.S., April 30, 2018. REUTERS/Mike Blake 

David Petraeus, Chairman, KKR Global Institute speaks at the Milken Institute 21st Global Conference in Beverly Hills, California, U.S., April 30, 2018. REUTERS/Mike Blake 

David Petraeus, Chairman, KKR Global Institute speaks at the Milken Institute 21st Global Conference in Beverly Hills, California, U.S., April 30, 2018. REUTERS/Mike Blake 

David Petraeus, Chairman, KKR Global Institute speaks at the Milken Institute 21st Global Conference in Beverly Hills, California, U.S., April 30, 2018. REUTERS/Mike Blake 

Former CIA director David Petraeus speaks to the media after a meeting with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus speaks to the media after a meeting with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus speaks to the media after a meeting with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus (C) arrives with Anthony Scaramucci, a member of the President elect's transition team, to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives with Anthony Scaramucci, a member of the President elect's transition team, to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives with Anthony Scaramucci, a member of the President elect's transition team, to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

Former CIA director David Petraeus arrives to meet with U.S. President elect Donald Trump at Trump Tower New York, U.S., November 28, 2016. REUTERS/Lucas Jackson 

U.S. Representative Trey Gowdy (R-SC) speaks to reporters about the continuing work of the House Select Committee on Benghazi at the U.S. Capitol in Washington, January 6, 2016. The panel interviewed former U.S. military commander and CIA director David Petraeus on Wednesday. REUTERS/Jonathan Ernst 

U.S. Representative Trey Gowdy (R-SC) speaks to reporters about the continuing work of the House Select Committee on Benghazi at the U.S. Capitol in Washington, January 6, 2016. The panel interviewed former U.S. military commander and CIA director David Petraeus on Wednesday. REUTERS/Jonathan Ernst 

Staff members carry locked satchels outside offices where the House Select Committee on Benghazi are interviewing former U.S. military commander and CIA director David Petraeus at the U.S. Capitol in Washington, January 6, 2016. REUTERS/Jonathan Ernst 

U.S. Representative Trey Gowdy (R-SC) departs after speaking to reporters about the continuing work of the House Select Committee on Benghazi at the U.S. Capitol in Washington, January 6, 2016. The panel interviewed former U.S. military commander and CIA director David Petraeus on Wednesday. REUTERS/Jonathan Ernst 

Former CIA director David Petraeus speaks after leaving the Federal Courthouse in Charlotte, North Carolina, April 23, 2015. Petraeus was sentenced to two years of probation and ordered to pay a $100,000 fine after pleading guilty to mishandling classified information. REUTERS/Chris Keane

Former CIA director David Petraeus leaves the Federal Courthouse in Charlotte, North Carolina, April 23, 2015. Petraeus was sentenced to two years of probation and ordered to pay a $100,000 fine after pleading guilty to mishandling classified information. REUTERS/Chris Keane

Former CIA director David Petraeus leaves the Federal Courthouse in Charlotte, North Carolina, April 23, 2015. Petraeus was sentenced to two years of probation and ordered to pay a $100,000 fine after pleading guilty to mishandling classified information. REUTERS/Chris Keane

Former CIA director David Petraeus leaves the Federal Courthouse in Charlotte, North Carolina, April 23, 2015. Petraeus was sentenced to two years of probation and ordered to pay a $100,000 fine after pleading guilty to mishandling classified information. REUTERS/Chris Keane

Former CIA director David Petraeus leaves the Federal Courthouse in Charlotte, North Carolina, April 23, 2015. Petraeus was sentenced to two years of probation and ordered to pay a $100,000 fine after pleading guilty to mishandling classified information. REUTERS/Chris Keane

Former CIA director David Petraeus pushes aside a television videographer as he arrives at the Federal Courthouse in Charlotte, North Carolina April 23, 2015. Petraeus will appear in federal court to face sentencing for allegedly leaking secrets to a mistress who was writing his biography.REUTERS/Chris Keane 

Former CIA director David Petraeus pushes aside a television videographer as he arrives at the Federal Courthouse in Charlotte, North Carolina April 23, 2015. Petraeus will appear in federal court to face sentencing for allegedly leaking secrets to a mistress who was writing his biography.REUTERS/Chris Keane

Former CIA director David Petraeus arrives at the Federal Courthouse in Charlotte, North Carolina on April 23, 2015. Petraeus will appear in federal court to face sentencing for allegedly leaking secrets to a mistress who was writing his biography.REUTERS/Chris Keane TPX IMAGES OF THE DAY

Former CIA director David Petraeus arrives at the Federal Courthouse in Charlotte, North Carolina on April 23, 2015. Petraeus will appear in federal court to face sentencing for allegedly leaking secrets to a mistress who was writing his biography.REUTERS/Chris Keane

Former CIA director David Petraeus arrives at the Federal Courthouse in Charlotte, North Carolina April 23, 2015. Petraeus will appear in federal court to face sentencing for allegedly leaking secrets to a mistress who was writing his biography. REUTERS/Chris Keane 

Retired General General David Petraeus speaks with a guest before the opening of the "National Reading of the Names" ceremony near the Vietnam Memorial in Washington May 24, 2014. REUTERS/Joshua Roberts (UNITED STATES - Tags: MILITARY ANNIVERSARY) 

U.S. Defense Secretary Chuck Hagel (R) greets retired General David Petraeus before the opening of the "National Reading of the Names" ceremony near the Vietnam Memorial in Washington May 24, 2014. REUTERS/Joshua Roberts (UNITED STATES - Tags: MILITARY ANNIVERSARY) 

People protest against David Petraeus, a retired army general and former director of the Central Intelligence Agency (CIA), at the University of Southern California in Los Angeles, California October 8, 2013, a day after the 12th anniversary of the beginning of the Afghanistan war. Petraeus was a general who commanded U.S. forces during troop surges in Afghanistan. REUTERS/Lucy Nicholson (UNITED STATES - Tags: POLITICS MILITARY CIVIL UNREST CONFLICT ANNIVERSARY) 

People with signs protest against David Petraeus, a retired army general and former director of the Central Intelligence Agency (CIA), at the University of Southern California in Los Angeles, California October 8, 2013, a day after the 12th anniversary of the beginning of the Afghanistan war. Petraeus was a general who commanded U.S. forces during troop surges in Afghanistan. REUTERS/Lucy Nicholson (UNITED STATES - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT ANNIVERSARY) 

Army veteran Tom Gillespie, 80, protests against David Petraeus, a retired army general and former director of the Central Intelligence Agency (CIA), at the University of Southern California in Los Angeles, California October 8, 2013, a day after the 12th anniversary of the beginning of the Afghanistan war. Petraeus was a general who commanded U.S. forces during troop surges in Afghanistan. REUTERS/Lucy Nicholson (UNITED STATES - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT ANNIVERSARY) 

People hold signs as they protest against David Petraeus, a retired army general and former director of the Central Intelligence Agency (CIA), at the University of Southern California in Los Angeles, California October 8, 2013, a day after the 12th anniversary of the beginning of the Afghanistan war. Petraeus was a general who commanded U.S. forces during troop surges in Afghanistan. REUTERS/Lucy Nicholson (UNITED STATES - Tags: POLITICS MILITARY CONFLICT CIVIL UNREST TPX IMAGES OF THE DAY ANNIVERSARY) 

Former CIA director and retired general David Petraeus gives the sign for "fight on", the motto of the University of Southern California, speaks as the keynote speaker at the university's annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA director and retired general David Petraeus speaks as the keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA director and retired general David Petraeus (L) shares the first slice of cake with Armed Services ROTC Cadet Hector Sandoval, during his visit as a keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA director and retired general David Petraeus serves as the keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA director and retired general David Petraeus serves as the keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA director and retired general David H. Petraeus speaks as the keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

Former CIA Director and retired general David H. Petraeus speaks as the keynote speaker at the University of Southern California annual dinner for veterans and ROTC students, in Los Angeles, California March 26, 2013. REUTERS/Alex Gallardo (UNITED STATES - Tags: EDUCATION) 

An "Honorary Consul" license plate is seen on a car in the driveway outside the home of Jill Kelley in Tampa, Florida, November 16, 2012. South Korea has recently dropped Kelley as an honorary consul following the scandal involving former CIA director David Petraeus. Picture taken November 16, 2012. REUTERS/Steve Nesius (UNITED STATES - Tags: POLITICS MILITARY TRANSPORT) 

An "Honorary Consul" license plate is seen on a car in the driveway outside the home of Jill Kelley in Tampa, Florida, November 16, 2012. South Korea has recently dropped Kelley as an honorary consul following the scandal involving former CIA director David Petraeus. Picture taken November 16, 2012. REUTERS/Steve Nesius (UNITED STATES - Tags: POLITICS MILITARY TRANSPORT) 

Paula Broadwell, the woman whose affair with CIA director David Petraeus led to his resignation, returns to her home in Charlotte, North Carolina November 20, 2012. REUTERS/John Adkisson (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (L), twin sister of Jill Kelley, and attorney Gloria Allred (R) leave after a news conference which explained her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (2nd L), twin sister of Jill Kelley, and attorney Gloria Allred (L) leaves after a news conference which explained her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, cries during a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, cries during a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, addresses a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (L), twin sister of Jill Kelley, and attorney Gloria Allred (R) address a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (L), twin sister of Jill Kelley, and attorney Gloria Allred (R) address a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, wipes her tears during a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, wipes her tears during a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (L), twin sister of Jill Kelley, and attorney Gloria Allred (R) address a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (R), twin sister of Jill Kelley, and attorney Gloria Allred (L) address a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam (L), twin sister of Jill Kelley, and attorney Gloria Allred (R) address a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY) 

Natalie Khawam, twin sister of Jill Kelley, addresses a news conference to explain her relationship with former CIA chief General David Petraeus and his wife Holly in Washington November 20, 2012. Anonymous emails that Paula Broadwell sent to Jill Kelley, a Tampa, Florida socialite who knew Petraeus, prompted an FBI investigation that exposed Broadwell's affair with Petraeus, a retired U.S. Army general known for his success in the Iraq war. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY) 

Paula Broadwell, the woman whose affair with former CIA chief David Petraeus led to his resignation, leaves her home in Charlotte, North Carolina November 20, 2012. REUTERS/John Adkisson (UNITED STATES - Tags: HEADSHOT POLITICS MILITARY)