The constitution clearly gives the Border Czar 100% responsibility for developing and enforcing all policies and procedures related to the nation's borders.
the title thing is dumb...as far as I can tell, that term started with Abbot down in texas when he wrote her a letter saying she ought to visit the border since she's the "border czar." then a lot of mainstream media picked it up and now they're backtracking from it.
point is, she did have an actual responsibility in trying to curb immigration. she was tasked with
both (1) the so-called "root causes" wishy washy stuff that wouldn't show any effect for a long time (and is a pretty unlucky assignment for someone with presidential aspirations); and (2) curbing illegal crossings more immediately. a lot of Harris apologists are trying to say her role was exclusively the former (and saying she had no role in the immediate effects), but that doesn't really jive with contemporary reports:
A senior administration official said Harris' role would focus on "two tracks": both curbing the current flow of migrants and implementing a long-term strategy that addresses the root causes of migration.
https://www.nbcnews.com/politics/white-house/biden-taps-harris-lead-coordination-efforts-southern-border-n1261952So yeah, there's obviously no such title as "border czar," but she was tasked with "curbing the current flow of migrants," at least per NBC's March 2021 reporting. But it is bizarre seeing clips like the one dax quoted with current day media reports saying "border czar??? huh? what are these guys talking about???" when there's a bunch of clips from contemporary media referring to her as the "border czar."