Former President Barack Obama is expected to endorse Joe Biden’s presidential bid on Tuesday, ending months of speculation over when he would finally back his two-term veep.

Obama will throw his support behind his former vice president’s campaign in a video announcement after Sen. Bernie Sanders ended his sputtering White House bid last week and then endorsed Biden yesterday, two sources familiar with the matter told The Post.

A source close to Obama said the endorsement would come via video that will be posted to social media later today.

The endorsement was first reported by CNN on Tuesday.

Obama’s endorsement comes after months of silence from the influential former president, who refused to endorse any Democrat even as Biden, 77, heavily invoked his relationship with Obama on the campaign trail.

But Obama was a key player behind the scenes, counseling Democratic candidates on their campaigns and reportedly encouraging Sanders, 78, to bow out of the race in several recent lengthy conversations.

Obama spoke to his former Senate colleague at least four times after Biden pulled away with a large delegate lead in last month’s Super Tuesday primary contests, according to a New York Times report published earlier Tuesday.

The former president, 58, also reportedly encouraged ex-South Bend, Ind., Mayor Pete Buttigieg to withdraw from the presidential race in early March while he still had influence, an event which marked the party’s rapid coalescence around Biden.

Obama, whose endorsement was the most coveted of the 2020 election, maintained a distance from the Democratic primary and refused to endorse his former veep even after bruising fourth- and fifth-place finishes in Iowa and New Hampshire.

In a “60 Minutes” interview last October, Biden claimed he asked Obama not to endorse him, saying he thought it was better if the former White House colleagues kept their distance.

But the claim was seen as an attempt to save face in the wake of Obama’s silence and amid reports the former president thought his two-term running mate didn’t have what it took to mount a successful presidential bid.

Biden is now the presumptive Democratic nominee, turning around a campaign that was once on life support, and leads President Trump in several recent polls, setting up a blockbuster general election fight.

A Biden campaign spokeswoman declined comment when reached by The Post.