US election: Barack Obama endorses Hillary Clinton

US president says Clinton is most qualified candidate for the White House, shortly after meeting rival Bernie Sanders.

"I'm with her, I'm fired up and I can not wait to get out there and campaign for Hillary"

US President Barack Obama has officially endorsed fellow Democrat Hillary Clinton for president, saying he did not think there had ever been a nominee "so qualified" for the White House.

"I want to congratulate Hillary Clinton, on making history as the presumptive democratic nominee for President of the United States" Obama said in a video released on Clinton's official YouTube Channel on Thursday.

"I'm with her, I'm fired up and I can not wait to get out there and campaign for Hillary," he added. "I don't think there has ever been someone so qualified to hold this office."