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Cindy McCain, wife of Sen. John McCain, R-Ariz. arrives with her sons Jack and Jimmy during a memorial service at the Arizona Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Cindy McCain, wife of US Senator John McCain, walks into the Arizona State Capitol Rotunda escorted by sons James McCain (L) and Jack McCain (R), August 29, 2018 in Phoenix, Arizona. - Senator John McCain, a decorated American war hero, US Senator and two-time presidential candidate, will lie in state at the Arizona State Capitol before being transported to Washington DC where he will be buried at Arlington National Cemetery. (Photo by Robyn Beck / AFP)ROBYN BECK/AFP/Getty Images

An early morning view before the casket of Senator John McCain is carried by members of the Arizona National Guard to the Arizona State Capitol Rotunda where he will lie in state, Aug. 29, 2018 in Phoenix, Arizona. - McCain, a decorated American war hero, US Senator and two-time presidential candidate, died on August 25, 2018 at the age of 81. ROBYN BECK/AFP/Getty Images

Cindy McCain, wife of Sen. John McCain, R-Ariz. wipes a tear away next to her son Jack during a memorial service at the Arizona Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Cindy McCain, wife of Sen. John McCain, R-Ariz. stands with her sons Jack and Jimmy, right, during a memorial service at the Arizona Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Cindy McCain, wife of Sen. John McCain touches the casket during a memorial service at the Arizona Capitol on Aug. 29, 2018, in Phoenix, Arizona. John McCain will lie in state at the Arizona State Capitol before being transported to Washington D.C. where he will be buried at Arlington National Cemetery. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Cindy McCain, wife of, Sen. John McCain, R-Ariz. stands over the casket during a memorial service at the Arizona Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Meghan McCain, daughter of, Sen. John McCain, R-Ariz. cries at the casket of her father during a memorial service at the Arizona Capitol on Wednesday, Aug. 29, 2018, in Phoenix.

Jack McCain, son of US Senator John McCain, touches his father's casket during a memorial service at the Arizona Capitol on Aug. 29, 2018, in Phoenix. ROSS D. FRANKLIN/AFP/Getty Images

Mourners touch the casket during a memorial service for US Senator John McCain at the Arizona Capitol on Aug. 29, 2018, in Phoenix. JAE C. HONG/AFP/Getty Images

Meghan McCain, daughter of the late US Senator John McCain, grieves during a memorial service for her father at the Arizona Capitol on Aug. 29, 2018 in Phoenix, Arizona. JAE C. HONG/AFP/Getty Images

Cindy McCain, wife of Sen. John McCain, R-Ariz. watches during a memorial service at the Arizona Capitol on Wednesday, Aug. 29, 2018, in Phoenix.

The Arizona National Guard carries the casket into the museum rotunda during a memorial service for Sen. John McCain (R-AZ) at the Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain, a decorated war hero, died August 25 at the age of 81 after a long battle with Glioblastoma, a form of brain cancer.

Mourners pay their respects to the late Sen. John McCain (R-AZ) as his body lies in state at the Arizona State Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain will lie in state at the Arizona State Capitol before being transported for burial at the U.S. Naval Academy Cemetery.

A former US Marine pays his respects at the casket of US Senator John McCain during a memorial service at the Arizona Capitol on Aug. 29, 2018, in Phoenix. JAE C. HONG/AFP/Getty Images

Mourners wait in line to pay their respects to the late Sen. John McCain (R-AZ) as his body lies in state at the Arizona State Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain will lie in state at the Arizona State Capitol before being transported for burial at the U.S. Naval Academy Cemetery.

Mourners wait in line to pay their respects to the late Sen. John McCain (R-AZ) as his body lies in state at the Arizona State Capitol on Aug. 29, 2018 in Phoenix, Arizona. Sen. McCain will lie in state at the Arizona State Capitol before being transported for burial at the U.S. Naval Academy Cemetery.