Movers, nuclear codes: This is what will happen as Obama hands reins to Trump on Inauguration Day

WASHINGTON – A few days from now, Donald Trump and his wife, Melania, will arrive at the White House for morning tea with President Obama and his wife, Michelle. Upstairs, in the residence, movers will rush around, simultaneously packing up the outgoing family's last belongings as they unload those of the Trumps.

By lunchtime, Obama will have handed over the reins of the world's most powerful nation to a man who vowed to tear down his biggest achievements and who defeated Obama's chosen successor. A military aide with a briefcase holding the U.S. nuclear launch codes will stop trailing Obama and leave the U.S. Capitol in Trump's entourage.

After a rancorous campaign that blew away precedent, an election result that shocked the political establishment and a transition by Twitter that upended convention, the unorthodox will be overtaken — at least for a few hours — by tradition.

The inauguration is "one of those great turning points" in the nation's political consciousness, historian William Seale said. "Everything was going along one way and suddenly there's a turnaround, and he won. A stop and a change. A re-evaluation."

Trump's swearing-in will be "the moment on the head of a pin," he said.

One of the most intriguing aspects of the day will be the limousine ride that Obama and Trump will share on the ride to the Capitol past thousands of onlookers. It promises to be especially awkward: Trump, the real estate magnate and reality-TV star who never held political office, spent years stoking false doubts about Obama's legitimacy to hold office. Obama spent months telling voters that Trump was uniquely unqualified to be president, declaring that it would be a personal insult were he elected.

"His instruction to me was, 'The campaign is over, I am now president for all the people,' " Tom Barrack, the chairman of Trump's inaugural committee, said at Trump Tower this week. Barrack, the chairman of Colony Capital said that the Republican wants to "heal the wounds" of the election, to reach out to Americans with questions and doubts and "build a bridge and tie them back in."

Much of downtown Washington will be closed to traffic to maintain tight security for the occasion. At recent inaugurations, dump trucks and buses have blocked streets just inside the perimeter to protect against truck bombs. About 28,000 personnel will be dedicated to security, from agencies including DHS, the Federal Bureau of Investigation, U.S. Capitol Police, U.S. Park Police and local law enforcement, Johnson said.

In a nod to the heavily rural constituency that helped propel him to the presidency, country singers Toby Keith and Lee Greenwood will be featured performers along with military bands at a "Make America Great Again!" event on the steps of the Lincoln Memorial the evening before the inauguration, the inaugural committee announced. Trump will address the crowd at the concert.

The inauguration itself will reflect Trump's background in reality television. Jackie Evancho, a teenager featured on "America's Got Talent" is to sing the national anthem.

Trump is seeking a "delicate balance between abiding by tradition" and leaving "his own fingerprint on a fresh canvas," Barrack said, but added, "Mostly he's abiding by tradition especially in the swearing-in ceremony."

That tradition includes having the chief justice of the U.S., John Roberts Jr., administering the oath of office to Trump; Vice President-elect Mike Pence has chosen Justice Clarence Thomas for his swearing-in.

When Obama was inaugurated, he and First Lady Michelle Obama stepped out of the armored presidential limousine and walked a stretch of the parade route. Trump's team hasn't said yet whether he will do the same.

There is always the potential for drama. Since the early days of the republic, the transfer of power often has been an awkward handoff. President Dwight Eisenhower thought President John Kennedy too young and inexperienced for the job, and Kennedy's wife Jackie hated that the Eisenhowers let them know it. Rosalynn Carter and Nancy Reagan didn't talk in the motorcade limo they shared on Inauguration Day.

This year, more than two dozen Democratic lawmakers have said they will boycott Trump's inauguration, according to a tally by CNN.

While most of focus will be on the Trumps' arrival, the Obamas will have their own emotional experience, said Kate Andersen Brower, a former Bloomberg News reporter and author of "First Women: The Grace and Power of America's Modern First Ladies."

On their last morning at the White House, the outgoing first family traditionally gathers the residence staff, about 100 people, in the State Dining Room to say goodbye. The staff present the family with a gift. By tradition, staff carpenters handcraft a box to hold two American flags, the one flown over the White House on the day the president was inaugurated and the one flying on his last day in office.