Cindy McCain, wife of, Sen. John McCain, R-Ariz., accompanied by White House Chief of Staff John Kelly, left, and Defense Secretary Jim Mattis, second from left, lays a wreath at the Vietnam Veterans Memorial in Washington, Saturday, Sept. 1, 2018, during a funeral procession to carry the casket of her husband from the U.S. Capitol to National Cathedral for a memorial service. McCain served as a Navy pilot during the Vietnam War and was a prisoner of war for more than five years. (AP Photo/Andrew Harnik, Pool)
By: Andrew Harnik
The family of Sen. John McCain, R-Ariz., front row from left, Meghan McCain, Bridget McCain and Cindy McCain, watches as his casket is carried to a hearse from the U.S. Capitol in Washington, Saturday, Sept. 1, 2018, in Washington, for a departure to the Washington National Cathedral for a memorial service. (Jim Lo Scalzo/Pool Photo via AP)
By: Jim Lo Scalzo
Cindy McCain, wife of, Sen. John McCain, R-Ariz., accompanied by President Donald Trump's Chief of Staff John Kelly, left, and Defense Secretary Jim Mattis, second from left, lays a wreath at the Vietnam Veterans Memorial in Washington, Saturday, Sept. 1, 2018, during a funeral procession to carry the casket of her husband from the U.S. Capitol to National Cathedral for a Memorial Service. McCain served as a Navy pilot during the Vietnam War and was a prisoner of war for more than five years. (AP Photo/Andrew Harnik, Pool)
By: Andrew Harnik
From left, former first lady Laura Bush, former President Bill Clinton, former Secretary of State Hillary Clinton, former vice president Dick Cheney and his wife Lynne and former vice president Al Gore arrive at a memorial service for Sen. John McCain, R-Ariz., at Washington Nationals Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
The flag-draped casket of Sen. John McCain, R-Ariz., is carried to a hearse from the U.S. Capitol in Washington, Saturday, Sept. 1, 2018, in Washington, for a departure to the Washington National Cathedral for a memorial service. McCain died Aug. 25 from brain cancer at age 81. (AP Photo/Jose Luis Magana)
By: Jose Luis Magana
Former President Barack Obama hugs former vice president Al Gore as former first lady Michelle Obama watches before the memorial services for Sen. John McCain, R-Ariz., at Washington Nationals Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Cindy McCain arrives at a memorial service for her husband, Sen. John McCain, R-Ariz., at the Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. Watching in the front row from left are President George W. Bush, former first lady Laura Bush, former President Bill Clinton, former Secretary of State Hillary Clinton, former Vice President Dick Cheney and his wife Lynne. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Meghan McCain speaks at a memorial service for her father, Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Dignitaries and invited guests attend a memorial service for Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Former Secretary of State Henry Kissinger speaks at a memorial service for Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Former President George W. Bush speaks at a memorial service for Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
Former President Barack Obama speaks at a memorial service for Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
From left, Meghan McCain, Cindy McCain, Jimmy McCain and his wife Holly pause as they watch the casket of Sen. John McCain, R-Ariz., arrive at the Washington National Cathedral in Washington, Saturday, Sept. 1, 2018, for a memorial service. McCain died Aug. 25 from brain cancer at age 81. (AP Photo/Susan Walsh)
By: Susan Walsh
The family of Sen. John McCain, R-Ariz., including from left, Andrew McCain, Doug McCain, second from left, Meghan McCain, from front row left, Bridget McCain, Cindy McCain, Jimmy McCain and Jack McCain, watch as the casket is carried down the steps of the U.S. Capitol in Washington, Saturday, Sept. 1, 2018, in Washington, for a departure to the Washington National Cathedral for a memorial service. (Marvin Joseph/The Washington Post via AP, Pool)
By: Marvin Joseph
Former President Barack Obama pauses as he speaks at a memorial service for Sen. John McCain, R-Ariz., at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)
By: Pablo Martinez Monsivais
The casket of Sen. John McCain, R-Ariz., is carried out of the Washington National Cathedral in Washington, Saturday, Sept. 1, 2018, after a memorial service, as Cindy McCain is escorted by her son Jimmy McCain and other family members. (AP Photo/Susan Walsh)
By: Susan Walsh
The family of Sen. John McCain, R-Ariz., follows as his casket is carried during the recessional at the end of a memorial service at Washington National Cathedral in Washington, Saturday, Sept. 1, 2018. McCain died Aug. 25, from brain cancer at age 81. (AP Photo/Pablo Martinez Monsivais)