There, a motorcade will take Bush to his presidential library at the university, where he will be laid to rest at a private ceremony next to his wife, Barbara, who died in April, and his daughter Robin, who died at age 3 in 1953.
In addition to the former presidents, former vice presidents and their spouses were also present.More news: Migrants Breach the U.S. Border Fence in a Bid for Asylum
"We are forever seat mates because of protocol", she said of Bush.
As the 72-year-old Bush arrived at the National Cathedral for the state funeral for his father - the 41st U.S. president - he shook hands with President Donald Trump and his wife, Melania.
She said Bush believed "service was all important and conveyed that to his children".More news: Wilder will try to avoid rematch at all costs, says Fury
George H.W. Bush and Bill Clinton eventually became close friends and traveled together internationally.
Just three months ago, Bush was caught on camera passing a cough drop to Michelle in an exchange that went viral during the funeral of late Senator John McCain.
"He taught us public service was noble and necessary", his son and the 43rd president, George W. Bush, told the invited guests at Washington National Cathedral.More news: The next challenge for Canada's oil patch comes from the sea
Mourners gathered at the airport to pay their respects to Bush as a black hearse waited for the flag-draped casket on the tarmac.