Then-President-Elect Barack Obama (left) shakes hands with Secretary of State-designate Sen. Hillary Clinton in 2008.

Charles Dharapak / AP

President Obama on Thursday officially endorsed Hillary Clinton to be his successor, days after she clinched the historic status of being the first woman to become the presumptive presidential nominee of a major party.

In a video posted by Clinton's campaign, Obama cited her skills on the campaign trail and her long record of public service, including her time as his secretary of state.

"Look, I know how hard this job can be — that's why I know Hillary will be so good at it," Obama said. "In fact, I don’t think there’s ever been someone so qualified to hold this office."

Watch the endorsement video here:

youtube.com

The endorsement was made public shortly after Obama's much publicized White House meeting with Clinton's main Democratic rival, Bernie Sanders, who has yet to concede the race.

Speaking to reporters after the meeting with Obama, Sanders vowed to take his campaign to Washington, D.C., on Tuesday, but said he looked forward to joining with Clinton to defeat Republican presumptive Republican presidential nominee Donald Trump.

Pablo Martinez Monsivais / AP

“I look forward to meeting with her in the near future to see how we can work together to defeat Donald Trump and create a government that represents all of us and not just the 1%,” he said.

Massachusetts Sen. Elizabeth Warren, a darling of the left after being elected in 2012, is also prepared to endorse Clinton’s presidential bid, Reuters first reported Wednesday.

Warren, 66, also has not ruled out running as Clinton’s vice president if she is asked — though she is not currently interested in the job, Reuters also reported, citing several sources close to the senator.

Warren’s representatives did not immediately respond to BuzzFeed News' request for comment.

For his part, Obama said he has seen Clinton's judgement, toughness, and work ethic in person, which is why, "I’m with her."

In fact, he plans to be with her Wednesday at a rally in Green Bay, Wisconsin, the campaign announced.

"I am fired up and I cannot wait to get out there and campaign for Hillary," Obama said.

LINK: Bernie Sanders Vows To Defeat Trump Alongside Clinton In Upcoming Elections

LINK: Never-Trump Republicans Start To Make Last-Ditch Plans For Cleveland

LINK: Clinton Embraces History