WASHINGTON (CNN) -- Friends, family and former presidents gathered Saturday at Washington National Cathedral to honor the life of the late Sen. John McCain.
The service follows a public procession that brought McCain's body from the US Capitol to the cathedral. The motorcade stopped along the way at the Vietnam Veterans Memorial, where Cindy McCain, the late senator's wife, laid a wreath in memory of those who served in the Vietnam War.
The ceremony will feature tributes from Republican former President George W. Bush, who prevailed over McCain in the race for the Republican presidential nomination in 2000, and Democratic former President Barack Obama, who ran against McCain in the 2008 presidential election and won.
The remarks from former Democratic and Republican presidents who were once rivals to McCain will send a message of unity and bipartisanship at a time when Washington is deeply divided.
McCain, who died at the age of 81 last Saturday after a lengthy battle with brain cancer, was an iconic figure in US politics. The Arizona Republican leaves behind a storied legacy of serving his country in Congress and in the military as a naval pilot.
Former Secretary of State Henry Kissinger, former Sen. Joe Lieberman of Connecticut and Meghan McCain, one of the late senator's daughters, are also on the list of those slated to speak at Saturday's memorial service.
Democratic former Vice President Joe Biden, who delivered an emotional eulogy for McCain at a memorial service in Arizona on Thursday, is serving as a pallbearer on Saturday.
Actor Warren Beatty, former New York City Mayor Michael Bloomberg, Democratic Sen. Sheldon Whitehouse of Rhode Island, former Democratic Sen. Russ Feingold of Wisconsin and former chief of staff to McCain Mark Salter are also serving as pallbearers, among others.
Republican Sen. Lindsey Graham of South Carolina, a close friend of McCain's, and McCain's children Jimmy and Sidney McCain are taking part in the ceremony as well.
While two former presidents will speak in honor of McCain, the current President will be notably absent.
CNN has previously reported that McCain did not want President Donald Trump to attend his funeral and former Alaska Gov. Sarah Palin, who was McCain's running mate in the 2008 presidential election, was not invited to any of the memorial services.
The President's daughter Ivanka Trump and her husband Jared Kushner are both attending the ceremony. Former Democratic President Bill Clinton and former Secretary of State Hillary Clinton are also at the service.
The Right Rev. Mariann Edgar Budde, the Episcopal bishop of Washington, will deliver a blessing during the service.
The service at Washington National Cathedral is one of several events honoring McCain's life this week.
On Thursday, a memorial service was held in Phoenix and on Friday, a ceremony was held in the US Capitol, where McCain's body was lain in state. On Sunday, a private service will take place at the US Naval Academy in Annapolis, Maryland, and then his body will be laid to rest in the US Naval Academy Cemetery.
CNN's Sophie Tatum and Kyle Feldscher contributed to this report.
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