Former presidents Bill Clinton and George W. Bush will join President Obama and 7,000 special guests at the formal dedication of the National Museum of African American History and Culture on Saturday morning, according to Smithsonian officials. The officials said that Hillary Clinton was invited as a former first lady, but not as the Democratic nominee for president, and that Republican nominee Donald Trump was not invited. “The Smithsonian doesn’t do politics,” Smithsonian spokeswoman Linda St. Thomas said in an email. It remains unclear whether Hillary Clinton will attend. Former first lady Laura Bush will join Michelle Obama for the long-awaited opening of the 19th Smithsonian museum, a $540 million building on Constitution Avenue between 14th and 15th streets. Obama will speak, as will George and Laura Bush. President Bush signed the bill authorizing the museum in 2003, and Laura Bush attended the groundbreaking in 2012. Former presidents Jimmy Carter and George H.W. Bush declined their invitations, along with their wives. Members of Congress, Smithsonian regents and museum donors and supporters will be among the thousands on the museum grounds for the outdoor ceremony Saturday. The public can watch the ceremony on Jumbotrons from the grounds of the Washington Monument, where a three-day festival celebrates the opening. The ceremony also will be broadcast on C-Span and BET. The event begins with an hour of musical performances at 9 a.m. In addition to Obama and the Bushes, the speakers include Smithsonian Secretary David J. Skorton, Rep. John Lewis, Supreme Court Chief Justice John Roberts, museum founding director Lonnie Bunch and Shirley Ann Jackson, president of the Rensselaer Polytechnic Institute. Patti LaBelle and Denyce Graves will perform. After the ceremony, the special guests will be able to tour the museum. Timed passes for the public begin at 2 p.m. The museum remains open until 8 p.m., while the Freedom Sounds festival continues until 10.