At least four people will deliver eulogies at the service: President George W. Bush, former Canadian Prime Minister Brian Mulroney, former Sen. Alan Simpson and presidential historian and Bush 41 biographer Jon Meacham.
The event will also include in attendance the Bush family, politicians and dignitaries, and all five living POTUSes: Jimmy Carter, Bill Clinton, Bush, Barack Obama and Donald Trump. Trump has designated Wednesday as a national day of mourning, which means federal offices and the stock market are closed.
After the service, Bushs coffin will fly to Houston for a private family burial Thursday.
Watch the livestream above.