President Obama said he "absolutely" has concerns about Donald Trump taking over, in his first news conference since the US election outcome.

Obama advised Trump to change his behaviour and said "governing is very different from campaigning".

He said: "I think what will happen with the president-elect is that there are going to be certain elements of his temperament that will not serve him well unless he recognises them and corrects them.

"There are certain things that make for good soundbites but don't always translate into good policy. That's something he and his team may wrestle with."

During their face-to-face meeting last Thursday, he said he offered Mr Trump "honest advice".

"We had a very cordial conversation," he said. "Do I have concerns? Absolutely."

Mr Obama told Mr Trump he must reach out to voters who did not support him.

He told journalists he thinks the President-elect will try to "send some signals of unity" to people who were alienated by his controversial campaign.

However Mr Obama would not be drawn into the row about Mr Trump's choice as Chief Strategist.

Stephen Bannon has been described by leading Republicans and Democrats as a "right-wing militant" who has advocated white supremacist causes and an anti-semitic rhetoric.