WASHINGTON, DC — President Barack Obama welcomed his successor, Donald Trump, to the White House, extending an olive branch to a man he has blasted as unfit to serve as commander in chief and who led the charge to challenge the legitimacy of his own presidency.

Thursday's Oval Office meeting is the symbolic start of the transition of power from Obama, a Democrat who ushered in a sweeping health care law and brokered a landmark nuclear accord with Iran, and Trump, a Republican who has promised to wipe away those initiatives. Trump takes office on Jan. 20.

Speaking briefly, the men appeared amicable and spoke briefly to the press.

"We talked about organizational issues in setting up the White House, we talked about foreign policy, we talked about domestic policy and as I said last night my No. 1 priority in the next two months is try to facilitate a transition that makes sure our president-elect is successful," Obama said.

"It is important for all of us regardless of party and regardless of political preferences to now come together and work together and deal with the many challenges we face," Obama said.

President-elect Trump said the meeting was originally set for only about 15 minutes but lasted nearly 90 minutes.

"We discussed a lot of situations, some wonderful and some difficult. I very much look forward to working with the president in the future," Trump said.

First lady Michelle Obama planned to meet privately in the White House residence with Trump's wife, Melania Trump, while Vice President Joe Biden prepared to see Vice President-elect Mike Pence.

Also on Trump's schedule was a meeting with House Speaker Paul Ryan, R-Wis., to discuss the GOP legislative agenda. Ryan, who holds the most powerful post in Congress, has been a sometime critic of Trump, was slow to endorse him and did not campaign with the nominee. Vice President-elect Mike Pence intended to join them.

The show of civility at 1600 Pennsylvania Avenue contrasted with postelection scenes of protests across a politically divided country. Demonstrators from New England to the heartland and the West Coast vented against the election winner on Wednesday, chanting "Not my president," burning a papier-mache Trump head, beating a Trump pinata and carrying signs that said "Impeach Trump."

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Republicans were emboldened by Trump's stunning victory over Hillary Clinton, giving the GOP control of the White House and both chambers of Congress.

"He just earned a mandate," Ryan said.

In an emotional concession speech, Clinton said her crushing loss was "painful and it will be for a long time" and acknowledged that the nation was "more divided than we thought."

Still, Clinton was gracious in defeat, declaring: "Donald Trump is going to be our president. We owe him an open mind and the chance to lead."

Trump was uncharacteristically quiet in the aftermath of his triumph and made no public appearances Wednesday. He huddled with jubilant, sleep-deprived advisers at his eponymous skyscraper in Manhattan, beginning the daunting task of setting up an administration that will take power in just over two months. He also met with Vice President-elect Mike Pence and took calls from supporters, family and friends, according to spokeswoman Hope Hicks.

Trump's team prepare for transition

In Washington, Trump's scant transition team sprang into action, culling through personnel lists for top jobs and working through handover plans for government agencies. A person familiar with the transition operations said the personnel process was still in its early stages, but Trump's team was putting a premium on quickly filling key national security posts. The person was not authorized to discuss details by name and spoke on condition of anonymity.

According to an organizational chart for the transition obtained by The Associated Press, Trump was relying on experienced hands to help form his administration. National security planning was being led by former Michigan Rep. Mike Rogers, who previously worked for the FBI. Domestic issues were being handled by Ken Blackwell, a former Cincinnati mayor and Ohio secretary of state.

Trump was expected to consider several loyal supporters for top jobs, including former New York Mayor Rudy Giuliani for attorney general or national security adviser and campaign finance chairman Steve Mnuchin for Treasury secretary. Former House Speaker Newt Gingrich and Tennessee Sen. Bob Corker were also expected to be under consideration for foreign policy posts.

As president-elect, Trump is entitled to get the same daily intelligence briefing as Obama — one that includes information on U.S. covert operations, information gleaned about world leaders and other data gathered by America's 17 intelligence agencies. The White House said it would organize two exercises involving multiple agencies to help Trump's team learn how to respond to major domestic incidents.

If Trump makes good on his campaign promises, the nation stands on the brink of sweeping change in domestic and foreign policy. He's pledged to repeal Obama's health care law and pull out of the landmark nuclear accord with Iran. He's vowed to build a wall along the U.S.-Mexico border and temporarily ban immigration from nations with terror ties.

It's unclear whether Trump will embrace many of the traditions of the presidency. He'll enter the White House owning his own private jet as well as a hotel just blocks away on Pennsylvania Avenue. He never allowed journalists to fly on his plane during the campaign, as is customary for White House nominees.

Issues of transparency bubbled up right from the start. On Wednesday evening, Trump aides said they would not bring the press corps to Washington with the president-elect for his meeting with Obama, breaking long-standing protocol.

Information from the Associated Press was used in this report.

Cox Media Group