Barack Obama has revealed he advised his successor Donald Trump not to attempt to run the White House “the way you would manage a family business”.

In an interview with ABC News, the outgoing president said that Donald Trump must “respect” US institutions.

Barack Obama said: “After you have been sworn in, you are now in charge of the largest organization on Earth.”

The president warned that there was a difference between governing and campaigning.

“There are world capitals and financial markets and people all around the world who take really seriously what he [Donald Trump] says,” he said.

Image source AP

Barack Obama also talked about the US intelligence agency’s report into alleged cyber-attacks by Russia and the attempt to influence the 2016 US presidential campaign.

He said that he had “underestimated” the impact of such attacks.

Barack Obama said: “I think that I underestimated the degree to which, in this new information age, it is possible for misinformation… and so forth to have an impact on our open societies.”

He added that a conversation had taken place with Donald Trump in which he had discussed the importance of having faith in the intelligence community.

“There are going to be times where the only way you can make a good decision is if you have confidence that the process is working,” the president said.

Last week Donald Trump said he was a “big fan” of intelligence agencies, after months of casting doubt on the Russian link to the security breach. But he later raised questions over how the Democratic Party had responded to the cyber-attacks.

Donald Trump will be inaugurated on Friday, January 20.