*President Obama has chosen a side.

After meeting with Democratic presidential nominee Bernie Sanders at the White House Thursday, POTUS has formally endorsed his rival Hillary Clinton for president.

“I don’t think there has ever been someone so qualified to hold this office,” Obama said in a video released by the Clinton campaign. “I’m with her, I’m fired up and I cannot wait to get out there and campaign with Hillary.”

Clinton’s 2008 battle against Obama for the Democratic ticket was just as contentious as her current battle against Sanders, if not more. However, Clinton went on to serve as Obama’s secretary of state during his first term in office.

Emerging from the White House after a meeting with Obama that lasted more than an hour, Sanders said he would continue his campaign through Tuesday’s final primary in Washington D.C. but vowed to work together with Clinton to defeat Donald Trump in November.

He warned that a Trump presidency would be a “disaster” and that he would “work as hard as I can to make sure that Donald Trump does not become president of the Untied States.”

“I look forward to meeting with (Clinton) in the near future to see how we can work together to defeat Donald Trump and to create a government which represents all of us and not just the 1%,” Sanders told reporters.

The Vermont senator thanked both Obama and Vice President Joe Biden for showing “impartiality” during the course of the Democratic campaign.

Watch Obama’s endorsement of Clinton below:

Clinton welcomed Obama’s endorsement in an interview with Bloomberg Politics, saying “it just means so much to have a strong, substantive endorsement from the president. Obviously I value his opinion a great deal personally.”

“It’s just such a treat because over the years of knowing each other, we’ve gone from fierce competitors to true friends,” she added.