Tens of thousands of people have filed past Ronald Reagan's flag-draped casket in an outpouring of grief.
More than 105,000 mourners had passed by the coffin at Reagan's presidential library in Simi, California, officials said.
The US's 40th president died on Saturday, aged 93.
Mrs Nancy Reagan, resting and preparing for funeral services in Washington, watched the scene on television at her Bel Air home
"It is unbelievable what I am seeing on TV," Mrs Reagan said. "The outpouring of love for my husband is incredible."
The viewing at the library was the first event in a week of national mourning. The body was to be flown to Washington today to lie in state at the Capitol, followed by a national funeral on Friday.
A riderless horse trailing a flag-draped coffin will walk behind the horse-drawn wagon carrying Ronald Reagan's casket to the Capitol. The horse - retired racer Sergeant York - will have an empty saddle and Reagan's riding boots reversed in the stirrups.
At the conclusion of the national funeral, the bells of the National Cathedral will ring 40 times and churches nationwide will join in. The body will then be flown back to California for burial at the library on Friday evening.
Reagan's daughter, Patti Davis, gave details of his final moments at his California home.
"At the last moment, when his breathing told us this was it, he opened his eyes and looked straight at my mother," she told Peoplemagazine. "Eyes that hadn't opened for days did, and they weren't chalky or vague. They were clear and blue and full of love. If a death can be lovely, his was."
AP