WASHINGTON (AP) — Donald Trump was sworn in as the 45th president of the United States Friday, taking the helm of a deeply divided nation and putting Republicans in control of the White House for the first time in eight years.

The billionaire businessman and former reality television star has pledged an era of profound change, energizing his supporters with promises to wipe away predecessor Barack Obama’s signature achievements and to restore America to a lost position of strength. But Trump’s call for restrictive immigration measures and his caustic campaign rhetoric about women and minorities have infuriated other millions of Americans. He assumes office as one of the most unpopular incoming presidents in modern history.

The pomp and pageantry of the inaugural celebrations were also shadowed by questions about Trump’s ties to Russia, which U.S. intelligence agencies have determined worked to tip the 2016 election to help the Republican win.

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Trump’s inauguration drew crowds to the nation’s capital to witness the history. It repelled others. More than 60 House Democrats refused to attend his swearing in ceremony in the shadow of the Capitol dome. One Democrat who did sit among the dignitaries was Hillary Clinton, Trump’s vanquished campaign rival who was widely expected by both parties to be the one taking the oath of office.

Instead, it was Trump placing his hand on two Bibles, one used by his family and another used for President Abraham Lincoln’s inauguration. At 70, Trump is the oldest person to be sworn in as president, marking a generational step backward after two terms for Obama, one of the youngest presidents to serve as commander in chief.

Trump takes charge of an economy that has recovered from the Great Recession but has nonetheless left millions of Americans feeling left behind. The nation’s longest war is still being waged in Afghanistan and U.S. troops are battling the Islamic State in Iraq and Syria. The American health care system was expanded to reach millions more Americans during Obama’s tenure, but at considerable financial costs. Trump has vowed to dismantle and rebuild it.

Donald Trump, minutes before being sworn in as 45th President of the United States, January 20, 2017 (CBSN)

Trump faces such challenges as the first president to take office without ever having held a political position or served in the military. He has stacked his Cabinet with established Washington figures and wealthy business leaders. Though his team’s conservative bent has been cheered by many Republicans, the overwhelmingly white and male Cabinet has been criticized for a lack of diversity.

Officials expected hundreds of thousands of people to flock to the National Mall to witness the inauguration of the 45th president, though early crowds appeared smaller than past celebrations. Demonstrations unfolded at various security checkpoints near the Capitol as police in riot gear helped ticket-holders get through to the ceremony.

In a show of solidarity, all of the living American presidents attended the swearing-in ceremony, except for 92-year-old George H.W. Bush, who was hospitalized this week with pneumonia. His wife, Barbara, was also admitted to the hospital after falling ill.

While Trump came to power bucking convention, he wrapped himself in the traditions that accompany the peaceful transfer of power. Following a morning church service with his family, Trump and his wife, Melania, had tea at the White House with Obama and outgoing first lady Michelle Obama.

The two couples greeted each other with handshakes and hugs, and Mrs. Trump presented Mrs. Obama with a gift. Following their private gathering in the executive mansion, the Trumps and Obamas traveled together to the Capitol for the swearing in ceremony.Festivities begin

The three days of inaugural festivities kicked off Thursday. Trump left his Trump-branded jet in New York and flew to Washington in a government plane, saluting an Air Force officer as he descended the steps with his wife, Melania. He and the incoming vice president, Mike Pence, solemnly laid a wreath at Arlington National Cemetery before joining supporters for an evening concert at the Lincoln Memorial.

Trump’s son, Don Jr., told MSNBC’s “Morning Joe” that as the various festivities got underway, “the magnitude of it all” was at last sinking in. He pronounced his father “ready to take office.”

“We’re going to unify our country,” Trump said at the close of the two-hour concert featuring country star Toby Keith, soul’s Sam Moore and The Piano Guys. But not singer Jennifer Holliday: She backed out after an outcry from Trump critics.

With rain a possibility, the National Park Service announced that it was easing its “no umbrella” policy for Friday, allowing collapsible umbrellas along the parade route and on the National Mall.

The nation’s soon-to-be president joked about the chance of a downpour. “That’s OK,” Trump told campaign donors at an event Thursday night, “because people will realize it’s my real hair.”

“Might be a mess, but they’re going to see that it’s my real hair,” he said.

Whatever the weather, Trump supporters were looking ahead to the day.

Chris Lehmann, 55, a maintenance supervisor from Belmar, New Jersey, said: “I’m so excited, I’m like, on top of the world.”

Eleanor Haven, 83, of Alexander City, Alabama, was attending the festivities with her son, Scott Haven. The pair said they had never been to a political event before attending a Trump “thank you” tour rally in Alabama after the election and were looking forward to Friday’s celebration.

“We’re excited for changes in the country,” Scott Haven said.Protesters

On the eve of the inauguration, protesters and Trump supporters clashed outside a pro-Trump event Thursday night, with police using chemical spray to try control demonstrators outside the “DeploraBall.” The name was a play on a campaign remark by Clinton, who once referred to some Trump’s supporters as a “basket of deplorables.”

All of the living American presidents were scheduled to attend the swearing in ceremony, except for 92-year-old George H.W. Bush, who was hospitalized this week with pneumonia. His wife, Barbara, was also admitted to the hospital after falling ill. Trump tweeted his well-wishes to the Bushes, saying he was “looking forward to a speedy recovery.”

Hillary Clinton, Trump’s vanquished campaign rival, also planned to join dignitaries at Capitol Hill.

While Trump revels in a celebratory lunch with lawmakers and parade down Pennsylvania Avenue — passing his newly opened Washington hotel — workers at the White House will set about the frantic process of moving out the Obamas and preparing the residence for its new occupants. Moving trucks were on standby Friday morning at the White House.

Obama, who will continue to live in Washington, was leaving town with his family after the inauguration for a vacation in Palm Springs, California. He planned to address a farewell gathering of staff at Joint Base Andrews before boarding his last flight on the military aircraft that ferries presidents on their travels.

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Associated Press writers Nancy Benac, Ben Nuckols, Alanna Durkin Richer, Jessica Gresko, Jill Colvin and Jonathan Lemire contributed to this report.