Hillary Clinton and Donald Trump are going back and forth on Twitter following President Obama's official endorsement of the former First Lady. 

Hearing the news, Trump said the country is finished with the same policies. 

Clinton then hit back a few minutes later with a response that quickly went viral. 

Then it was RNC Chairman Reince Priebus' turn...

And of course, Trump would not let that sit, either.

The endorsement from Obama was rumored for the past few days and the official video message came out just after Obama met with Bernie Sanders at the White House.

Obama touted the difficulties of holding the office and said he knows "Hillary will be so good at it."

"I don't think there's ever been someone so qualified to hold this office," he said.

Clinton clinched the nomination earlier this week with victories in California and New Jersey.

Sanders has vowed to stay in the race, saying he will campaign ahead of Tuesday's primary in D.C.

The White House said President Obama will be on the campaign trail with Clinton next week in Green Bay, Wisconsin.