While he pretends to be impressed by her, President Biden privately thinks Kamala Harris is a "work in progress," according to a new book.

Biden's tepid performance review reflects how most Americans feel about Harris, whose embarrassing tenure has scared off many allies.

Biden dissed Harris: book

According to Chris Whipple’s The Fight of His Life: Inside Joe Biden’s White House, Biden was "furious" about the border crisis early in his presidency, cursing loud enough for staff to hear.

“From all over the West Wing, you could hear the president cursing, dropping f-bombs (he’d always apologize when women were present)."

Harris, who Biden appointed as "border czar," was angry, too, and she made it known through her husband, Douglas Emhoff, that she wasn't satisfied with her work portfolio, which she found burdensome to her political ambitions.

Biden was "annoyed" by Harris' complaining, and he told a friend that Harris was a "work in progress," an assessment of the deeply unpopular vice president that is shared by many Americans.

Failed president

Harris' awkwardness and incompetence have long been a burden to the Biden administration. In an infamous interview early in Biden's presidency, she left White House staffers with heartburn by remarking she "hadn't been to Europe" when pressed on the border crisis.

Her performance hasn't improved much since -- but to her credit, Biden hasn't been very impressive, either.

The historically unpopular president showed a poor grasp of the border crisis, which he has never actually acknowledged existing, during a briefing Thursday where he said "no one" understands the border better than Harris does.

Biden accidentally referred to Harris as the president, something he has done many times before, while touting the so-called work she has done addressing the "root causes" of mass immigration.

"President Harris led this effort — led this effort to make things better in the countries from which they are leaving," he said.

Biden asks: why me?

In reality, Harris has been to the border only once, although that's more than Biden, who has never seen it during his two years as president despite pressure to do so.

According to Whipple, Biden was preoccupied with the border early on in his presidency and despaired over a lack of "solutions." If that's so, Biden hasn't shown much urgency to address the matter in public -- his first planned trip to the border is taking place this weekend.

It remains to be seen whether Biden will leave Harris for dead, or if Biden will even run for re-election, but decision time is coming. You have to admit, they make a dynamic duo.