A former senior Biden official said Vice President Kamala Harris' work on immigration and the border was "at best ineffective," and suggested she didn't see it as her responsibility in a lengthy report on Team Biden infighting over the continuing crisis.

Axios reported on Monday that Harris and her aides made it clear early on that her responsibilities started and ended with working on root causes and factors driving immigration from countries like Guatemala, El Salvador and Honduras, known as the Northern Triangle. 

President Biden tasked Harris to take on the root causes of the border crisis. 

"She's been at best ineffective, and at worst sporadically engaged and not seeing it was her responsibility. It's an opportunity for her, and she didn't fill the breach," a former Biden administration official told the media outlet.

Vice President Kamala Harris speaks during a 'First In The Nation' campaign rally at South Carolina State University on February 02, 2024, in Orangeburg, South Carolina. (Brandon Bell/Getty Images)