Sen. Bernie Sanders joined Hillary Clinton in New Hampshire today to officially endorse her for the White House, saying "Secretary Clinton has won the Democratic nomination."

Clinton then took the stage to go after Donald Trump, saying his "voodoo economics" are the same policies that have failed in the past. 

"You can put lipstick on a pig, but it's still a pig," she said.

The scene drew a quick response from Trump, who took to Twitter to slam Sanders for "selling out" by supporting Clinton after their hard-fought primary battles. 

And on Facebook, Trump released a video showcasing Sanders' highly critical statements about Clinton. In particular, he emphasized Sanders saying a few months ago that Clinton is "not qualified."

Meantime, Sanders went right back at Trump with a tweet of his own. 

Sanders' supporters, however, lashed out at the socialist candidate on Twitter...