Wednesday would have been his 82nd birthday.
Cindy McCain pressed her face against the flag-draped casket of her husband, U.S. Sen. Jon Kyl who both gave heartfelt remarks. "We finally got it right".
Former presidents George W. Bush and Barack Obama are expected to speak at the ceremony on Saturday.
McCain, the son and grandson of Navy admirals, will be laid to rest beside his Naval Academy classmate and lifelong friend, the late Admiral Chuck Larson, organizers said.
Ducey, a Republican, has said he will wait until after McCain's burial to name a successor.
A motorcade with Sen.
(L-R front) Cindy McCain, wife of US Senator John McCain, with her sons Jack, Jimmy, and daughter' Meghan and Bridget (R rear), attend the memorial service for Snator McCain at the Arizona Capitol on August 29, 2018, in Phoenix.
A black hearse carrying Sen. Arizona residents have lined up at the state capitol to pay their respects to Senator John McCain. The Arizona Republican died Saturday of an aggressive form of brain cancer. Their choice, U.S. Representative Martha McSally, is a staunch Trump supporter, as were her two rivals for the nomination.
A few dozen white folding chairs were reserved for family and dignitaries beside a wreath of white roses. The public is welcome to line up along the route to pay their respects as the motorcade drives along I-17 North, Camelback Road and Central Avenue.
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Davis told BuzzFeed News Monday night he regretted being the anonymous source as well as his subsequent denial. According to BuzzFeed News, Davis was the confirming source for all of that.
Davis said it would be McCain's drive that he'll remember the most about the giant of the Senate who was serving his sixth term when he died Saturday at the age of 81.
Inside, former military members in shorts and T-shirts saluted.
Veteran Judith Hatch handed out flags to those assembled, saying Arizona lost a champion for the military.
The air around the Arizona State Capitol was heavy as McCain's body moved from the A.L. Moore Grimshaw-Mortuary Wednesday morning.
Arizona residents have lined up at the state capitol to pay their respects to Senator John McCain, who endured five-and-a-half years as a prisoner of war in Vietnam before becoming one of the most powerful USA lawmakers and a two-time Republican presidential candidate.
"We are grateful to have been gathered here today in the Arizona State Capitol to honor the life and memory of Thy servant, John Sidney McCain", Flake said.
His friends throughout government spoke at a private ceremony in the rotunda.
Graham also said he would offer Trump some advice: Act more like McCain.
Mr McCain is only the third person to lie in state in the Arizona statehouse rotunda in the past 40 years, according to ceremony organisers.
The two political giants feuded for years over public policy and other matters.