Donald Trump will soon be sworn in as the 45th President of the United States during a historic transfer of power that encapsulates American democracy even in politically divisive times.

Trump, President Barack Obama and their families are at the Capitol as the inauguration ceremony is underway.

The traditions of the day began unfolding early Friday morning. Trump and his family attended a private worship service at St. John's Church, known as the church of presidents. The Obamas greeted Trump and soon-to-be First Lady Melania Trump at the North Portico of the White House before hosting them for tea.

Obama left the White House for the final time as president, riding alongside Trump to Capitol Hill.

Earlier in the morning, Obama wrote a letter to Trump and left it on the Resolute Desk in the Oval Office, as outgoing presidents typically do for their successors. As Obama left the Oval Office for the final time, he was asked if he had any words for the American people. "Thank you," Obama said.

Trump will take the oath of office on the West Front of the Capitol just before noon, swearing to preserve, protect and defend the Constitution. That moment will mark the culmination of a stunning upset victory in last year's bitter presidential election.

Former Presidents George W. Bush and Bill Clinton are attending the ceremonies. Hillary Clinton, who Trump defeated in the November election, is also at the Capitol in a show of support for national unity and the peaceful transfer of presidential authority.

The customs and symbolism that are playing out -- from Trump's ride to the Capitol with Obama to the First Couple's dance at an inaugural ball -- are familiar. But the circumstances of this inauguration -- the 58th in the nation's history -- could hardly be more unconventional.

When the presidential primary season began nearly a year ago, few thought Trump could survive the battle for the Republican nomination -- much less beat Clinton to win the presidency. He will be the oldest president sworn in for a first term and the first president with no previous diplomatic, political or military executive experience.

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