Former White House chief of staff John Kelly, seen here on a visit to the Aisne-Marne American Cemetery in Belleau, France, in 2018, has criticized his former boss Donald Trump. Geoffroy Van Der Hasselt/AFP via Getty Images hide caption
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President Biden visits the Aisne-Marne American Cemetery to pay his tribute to fallen US soldiers of the World War I, in Belleau, Northern France, on June 9, 2024. Saul Loeb/AFP via Getty Images/AFP hide caption
Biden visits a military cemetery that Trump reportedly said was 'filled with losers'
White House communications official Bill Shine (left), then-White House chief of staff John Kelly and senior adviser Jared Kushner wait in the Oval Office in December 2018. The New York Times reports that Kelly opposed Kushner's security clearance, but President Trump overruled him and others. Brendan Smialowski/AFP/Getty Images hide caption
President Trump speaks during a meeting with Democratic congressional leaders in the Oval Office on Tuesday. Evan Vucci/AP hide caption
President Trump announced Saturday that White House chief of staff John Kelly would be leaving the administration by the end of the year. Alex Wong/Getty Images hide caption
John Kelly took over as chief of staff six months into the Trump presidency, and he initially helped bring military discipline to a sometimes chaotic White House. Evan Vucci/AP hide caption
Omarosa Manigault Newman, when she was still a White House staffer. She has since written a book about her time with the Trump administration, which prompted President Trump to call her a "lowlife" on Twitter. Saul Loeb/AFP/Getty Images hide caption
In her new book, Unhinged, former White House aide Omarosa Manigault Newman writes as a Trump world insider overjoyed at his election while airing concerns about his rhetoric, policies and mental state. Becky Harlan/NPR hide caption
Omarosa Tells NPR She Heard Trump 'N-Word Tape,' Contradicting Her Own Tell-All Book
White House Chief of Staff John Kelly in his office in the West Wing. John W. Poole/NPR hide caption
John Kelly On Trump, The Russia Investigation And Separating Immigrant Families
President Trump addresses reporters as he leaves for Dallas to speak at the National Rifle Association convention on Friday. J. Scott Applewhite/AP hide caption
White House Chief of Staff John Kelly is denying that he called President Trump an "idiot." He called reports to that effect, "B.S." Pablo Martinez Monsivais/AP hide caption
John Kelly says he "did something wrong" to get chief of staff job and have to give up leading the Department of Homeland Security. Mandel Ngan/AFP/Getty Images hide caption
Former White House staff secretary Rob Porter (left), White House chief of staff John Kelly and White House senior adviser Jared Kushner cross the White House South Lawn in August. Kelly on Friday outlined new security clearance protocols after questions were raised about Porter's access. Alex Brandon/AP hide caption
White House press secretary Sarah Huckabee Sanders with then-staff secretary Rob Porter in August. In the wake of Porter's resignation, Sanders has reassured reporters that President Trump is sympathetic to victims of domestic abuse. Alex Brandon/AP hide caption
White House chief of staff John Kelly and staff secretary Rob Porter leave the White House on Friday. Porter resigned Wednesday following domestic abuse allegations. Manuel Balce Ceneta/AP hide caption
Senate Minority Leader Chuck Schumer of New York speaks to reporters following a policy luncheon Tuesday on Capitol Hill in Washington, D.C. Andrew Harnik/AP hide caption
White House chief of staff John Kelly pauses to look to a video monitor as he appears on Special Report with Bret Baier on Fox News in Washington, on Wednesday. Carolyn Kaster/AP hide caption
White House Chief of Staff John Kelly listens as President Trump speaks at the White House on Oct. 19. Kevin Dietsch/Pool/Getty Images hide caption
President Trump's cooperation with congressional Democratic leaders Nancy Pelosi (left) and Chuck Schumer (center) appears to have won public approval. Nicholas Kamm/AFP/Getty Images hide caption
President Trump speaks with newly sworn-in White House chief of staff John Kelly at the White House on July 31. Kelly is one of four former generals who were appointed to top administration positions. Jim Watson/AFP/Getty Images hide caption
Why Donald Trump Likes To Surround Himself With Generals
Anthony Scaramucci blows a kiss to the gathered press in the White House briefing room on July 21, as White House press secretary Sarah Huckabee Sanders stands by. Chip Somodevilla/Getty Images hide caption
New White House chief of staff John Kelly was sworn in by President Trump on Monday. Evan Vucci/AP hide caption
In a tweet Friday evening, President Trump named John Kelly, secretary of homeland security, as his new chief of staff. Drew Angerer/Getty Images hide caption
Secretary of Homeland Security John Kelly (left) and Chief of United States Border Patrol Ronald Vitiello during a meeting held at the San Ysidro Port of Entry in San Diego in February. Denis Poroy/AP hide caption