From the Repub point of view, Harris would be the worst possible AG.
For she has already threatened to hijack any state legislation that goes against her liberal views, holding it up by AG decree, and/or Dem-Fed-court decree.
This will be the end of states' rights, and the total tyranny of the federal gov't over them.
This is what the Dems want, just as they want to end the Constitutional electoral college system, because of the power that it gives to the states.
The Dems only want federal tyranny over everyone.
The realization of this by "the deplorables" is the whole source of Trump's amazing, populist power. And this is what utterly maddens the Dems.
This is why they are trying so pathetically to impeach Trump before 2020 and their loss to him at that time.
For the Dems see Trump as just the latest Mussolini, when in fact Trump only wants to maintain the Liberty of the People, and hold off the fascist, "politically correct" regime which the Dems want to impose across the entire country.