President-elect Donald Trump has said he will consider keeping parts of 'Obamacare'
His comments to the Wall St Journal come after a campaign in which he vowed to rip it up
President Obama's healthcare law has extended health insurance to millions
Mr Trump also announced his transition team, with Chris Christie replaced by Mike Pence at its helm
Protests against Trump's victory erupted for a second night
Politico is live-streaming the news conference on Facebook.
Image source, APWhite House spokesman Josh Earnest is fielding questions from the press.
He says Obama and Trump did not resolve "all their differences" at their meeting just now.
What Obama said on the campaign trail represented his "authentic views," Earnest added.
Donald Trump and Barack Obama discuss their meeting at the White House
Donald Trump and Vice-President-elect Mike Pence are now meeting with House Speaker Paul Ryan.
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While Donald Trump was meeting President Obama, a small group of protesters assembled outside the White House.
Just next to them, work has already begun on setting up a watching platform for the inauguration ceremony on 20 January next year.
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Donald Trump is famously averse to shaking hands due to a fear of germs, external.
But as the next president, he is going to have to get used to pressing flesh with other world leaders for the cameras.
His handshake just now with President Obama is a historic one between two men with no love lost.
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Image source, Getty ImagesDonald Trump has now left the White House after spending 90 minutes chatting with President Obama in private.
It appears the pair put their significant differences to one side to have a cordial meeting - at least going by the image they presented to the media.
The pair spoke of their teams working together on key issues, while Trump even mentioned benefiting from Obama's "counsel" in times ahead.
Of course, the Republican candidate has pledged to do away with much of Mr Obama's legacy, including Obamacare and the Iran nuclear deal.
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Image source, Getty ImagesThe Republican, who famously questioned if Obama was really born in the US, notes the pair have not met before.
The meeting, he adds, was a "great honour".
A little over two months ago, he tweeted, external that President Obama "will go down as perhaps the worst president in the history of the United States".
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Image source, EPAPresident-elect Donald Trump says the pair, who have a thorny history, "discussed a lot of situations, including some difficulties".
The meeting, he says, lasted longer than scheduled.
President Obama said the conversation was "excellent" and he was encouraged by Trump's desire to work with his team on important issues.
Image source, APThe president says it's important that "we all come together to face challenges".
He tells Trump: "We will do everything we can to help you suceed".
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Image source, AFPSome lines are now coming in about the Trump-Obama meeting.
President Obama says they had a "wide-ranging conversation".
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It's been nearly 90 minutes since Donald Trump arrived at the White House.
He's been speaking to President Obama inside the Oval Office, which he will soon occupy.
Trump's son-in-law Jared Kushner has been seen getting a tour of the White House grounds from Obama's chief-of-staff Denis McDonough.
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Tara McKelvey
BBC News, Washington DC
Image source, PoolWhite House staffers watch as Obama speaks to the nation on Wednesday
Mr Trump plans to upend Washington DC. He ran against the establishment, a group of insiders who work for the White House and on Capitol Hill, as well as in the media and for lobbying groups and think-tanks.
Along the campaign trail he has issued warnings to "those who control the levers of power in Washington". He told people in the audience that the days of the Washington establishment would soon be over.
He said: "Our campaign represents a true existential threat like they haven't seen before."
Donald Trump is an outsider with no Washington experience. He does not have a vast team of advisers, people he's worked with for years in this town - nor does he want one.
No wonder those in the establishment are concerned. They're wondering what will happen to the country - and to them.
Read more about how the Washington establishment is reacting
Trump has a busy day after meeting Obama. He's meeting Kentucky Senator and Republican leader Mitch McConnell at 13:30 EST [18:30 GMT], according to McConnell's office.
The Republican has been at the centre of multiple congressional efforts to repeal Obamacare. He drew criticism during the 2012 campaign for saying that his party's highest priority should be "to deny President Obama a second term".
Trump aide Dan Scavino and other members of the president-elect's staff arrive at the White House as the meeting continues inside.
Image source, GetDonald Trump's campaign chief Kellyanne Conway appears to have been offered a role in his White House judging by a tweet she sent a few minutes ago.
She was widely credited with turning his campaign's fortunes around after taking the role in August, so it would be no great surprise if she was given a staff position.
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President-elect Trump is meeting with President Obama at the moment, but it isn't his first time at the White House. He met President Reagan there at a reception in 1987.
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Obama Chief-of-Staff Denis McDonough has been seen by reporters walking near the Rose Garden with Jared Kushner, who is married to Trump's daughter Ivanka.
Other Trump aides, including Dan Scavino, are also there.
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