Barack Obama has delayed endorsing Vice President Kamala Harris as the Democratic Party’s presidential nominee because he doubts she can beat Donald Trump, according to a report.

President Joe Biden was quick to endorse Harris, which prompted other big-name Dems to follow suit, but Obama has been the notable exception.

“Obama’s very upset because he knows she can’t win,” an unnamed Biden family source told the New York Post, adding that he was “shocked” at how quickly Biden gave his stamp of approval.

According to the Post source, Obama wanted former astronaut and Arizona Sen. Mark Kelly “at the top of the ticket,” and now he is “furious” things haven’t gone his way.

The Associated Press on Thursday reported that its sources say Obama will soon endorse Harris.

Rod Blagojevich, the disgraced former governor of Illinois, claims “Obama was instrumental” in getting Biden to step down from the race.

“Without Obama, Biden is still the Democratic nominee,” Blagojevich told the Post. “Obama was the conductor leading the orchestra that convinced Biden to step aside.”

The former Democrat was impeached in 2009 for attempting to sell Obama’s vacant Senate seat, removed from office and convicted on corruption charges a year later.

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He added of Obama: “He’s running the Democratic Party like a Chicago ward boss, from the shadows in the back room. In this case, it’s a big back room because he has a lot of big houses.”

The Biden family source said Harris’ unpredictability is what concerns Obama.

“Obama knows she’s just incompetent — the border czar who never visited the border, saying that all migrants should have health insurance,” the insider said. “She cannot navigate the landmines that are ahead of her.”

They added: “When you are running for president, there are things you can and can’t say.”

The Post’s source claims that a faceoff between Trump and Harris will be what does her in.

“Wait until the debate… she can’t debate,” they said. “She’s going to put her foot in her mouth about Israel, Palestine, Ukraine. She’s going to say something really stupid.”

They continued: “Obama knew this was going to happen, Joe knew this was going to happen. Now she is going to have to answer real questions.”