VP's don't set policy or manage anything...just ask Mike Pence...and as far as the Border is
concerned, the only "Czar" is Alejandro Mayorkas...Kamala Harris' role has been to speak with certain countries about why their citizens are seeking refuge in the U.S...and wrt Foreign Affairs, she is the Emissary for our President when requested...otherwise, she just needs to be available in case Joe Biden can't perform his duties as President, and cast tie-breaking votes in the Senate.
You should know this by now.d