U.S. President Barack Obama on Thursday formally threw support behind Democratic presidential candidate Hillary Clinton for president.

"I don't think there's ever been someone so qualified to hold this office," said Obama in a video posted on Clinton's Facebook page.

"I'm with her. I'm fired up and I cannot wait to get out there and campaign with Hillary," said Obama.

Obama's endorsement came just moments after his meeting with Vermont Senator Bernie Sanders, Clinton's rival in the nomination race, in the White House.

Although he still declined to endorse Clinton at the moment, Sanders told reporters after the meeting that he would do everything "to make sure Donald Trump does not become president of the United States.

source : xinhua