George P. Bush touches the flag-draped casket after giving a eulogy during a funeral for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018. (Mark Humphrey/AP Photo)
Former President George W. Bush leaves St. Martin's Episcopal Church in Houston after the funeral service for his father, former President George H.W. Bush. (Gerald Herbert/AP Photo)
Granddaughters Nancy Ellis LeBlond Sosa, left, and Georgia Grace Koch read scripture during a funeral for former President George H.W. Bush at St. Martin's Episcopal Church. (Mark Humphrey/AP Photo)
The flag-draped casket of former President George H.W. Bush is carried by a joint services military honor guard Thursday, Dec. 6, 2018, in Spring, Texas. (David J. Phillip, Pool/AP Photo)
Former President George W. Bush and wife, Laura Bush, former Florida Gov. Jeb Bush, and wife Columba, and Neil Bush, right, and wife Maria, after the funeral for their father. (Gerald Herbert/AP Photo)
Former President George W. Bush talks with Neil Bush and his wife Maria, front, after a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church. (David J. Phillip, Pool/AP Photo)
The choir listens during a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018. (David J. Phillip, Pool/AP Photo)
Former President George W. Bush and Laura Bush talk with Neil Bush and his wife Maria, right, after a funeral service for former President George H.W. Bush. (David J. Phillip, Pool/AP Photo)
Reba McEntire sings "The Lord's Prayer" during a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
James Baker greets family members as he arrives at a funeral for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018. (Mark Humphrey/AP Photo)
Granddaughters Nancy Ellis LeBlond Sosa, left, and Georgia Grace Koch read scripture during a funeral service for former President George H.W. Bush. (David J. Phillip, Pool/AP Photo)
Nancy Ellis LeBlond Sosa, left, and Georgia Grace Koch read scripture during a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday. (David J. Phillip, Pool/AP Photo)
The Oak Ridge Boys sing "Amazing Grace" during a funeral service for former President George H.W. Bush at St. Martins Episcopal Church on December 6, 2018. (David J. Phillip-Pool/Getty Images)
Rev. Russell J. Levenson Jr., gives the homily during a funeral service for former President George H.W. Bush at St. Martin’s Episcopal Church. (David J. Phillip, Pool/AP Photo)
George P. Bush walks past the casket of former President George H.W. Bush after giving a eulogy at St. Martin's Episcopal Church. (David J. Phillip, Pool/AP Photo)
George P. Bush gives a eulogy during the funeral for former President George H.W. Bush at St. Martin's Episcopal Church, Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
Elizabeth Dwen Andrews reads scripture during a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018. (David J. Phillip, Pool/AP Photo)
Granddaughter Barbara Pierce Bush reads scripture during a funeral service for former President George H.W. Bush at St. Martins Episcopal Church on December 6, 2018 in Houston. (David J. Phillip-Pool/Getty Images)
Former President George W. Bush embraces former Secretary of State James Baker, right, after he gave a eulogy during the funeral for former President George H.W. Bush. (David J. Phillip-Pool/Getty Images)
The flag-draped casket of former President George H.W. Bush is carried by a joint services military honor guard into St. Martin's Episcopal Church in Houston on Dec. 6, 2018. (Mark Humphrey/AP Photo)
Members of the Oak Ridge Boys arrive for a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
Reba McEntire arrives for a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
Former President George W. Bush arrives for a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
Family and friends attend a funeral service for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (David J. Phillip, Pool/AP Photo)
Former California Gov. Arnold Schwarzenegger arrives at a funeral for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (Gerald Herbert/AP Photo)
Guests arrive at St. Martin's Episcopal Church for the State Funeral for former President George H.W. Bush Thursday, Dec. 6, 2018, in Houston. (Gerald Herbert/AP Photo)
Houston Texans' J. J. Watt arrives at a funeral for former President George H.W. Bush at St. Martin's Episcopal Church Thursday, Dec. 6, 2018, in Houston. (Gerald Herbert/AP Photo)
Guests arrive at St. Martin's Episcopal Church for the State Funeral for former President George H.W. Bush Thursday, Dec. 6, 2018, in Houston. (Gerald Herbert/AP Photo)
Workers prepare for a departure ceremony of the casket of former President George H.W. Bush at Union Pacific Westfield auto facility Thursday, Dec. 6, 2018, in Spring. (Kiichiro Sato/AP Photo)
Workers prepare for a departure ceremony of the casket of former President George H.W. Bush at Union Pacific Westfield auto facility Thursday, Dec. 6, 2018. (Kiichiro Sato/AP Photo)
A police officer walks outside St. Martin's Episcopal Church before the State Funeral for former President George H.W. Bush Thursday, Dec. 6, 2018, in Houston. (Gerald Herbert/AP Photo)