Biden put her in charge of the border, the southern border in particular. He said that when she speaks on the border that she is speaking for HIM. The reliable media often called her the border czar at the time. Czar being a term widely understood as someone being in charge and having power in a particular area.
Now Harris herself, democrats, the very same reliable media and useful idiots who called her border czar before claim that she never was.
Please stop embarrassing yourselves, even though you can't.