Former President Barack Obama and former first lady Michelle Obama have endorsed Kamala Harris in her White House bid, giving the vice president the expected but still crucial backing of the nation's two most popular Democrats.

The endorsement, announced Friday morning in a video showing Harris accepting a joint phone call from the former first couple, comes as Harris continues to build momentum as the party's likely nominee after President Joe Biden's decision to end his reelection bid and endorse his second-in-command against Republican nominee and former President Donald Trump.