US President Barack Obama says he has 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, Mr Obama said that Mr Trump must "respect" US institutions.
"After you have been sworn in," he said, "you are now in charge of the largest organisation on Earth".
He 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 [Mr Trump] says," Obama said.
Mr 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.
He said that a conversation had taken place with Mr Trump in which he had discussed the importance of having faith in the intelligence community.
banglarkantho/09 January 2017/A.H Sina