Trump failed due to opposition, not because of policy desire.Did Trump say he was going to build the wall and Mexico was going to pay for it? Yes he did and he failed miserably in that effort.
I'm not going to defend BIDEN's role in the immigration crisis because he should have handled it much better than he did, but NO she was not the border czar, that was the label Republicans put on her when she was only tasked with addressing the root causes of migration from the Northern Triangle countries.
In that role, she did help bring billions of public and private investment to the region and also visited the region to dissuade people from coming. And since the numbers from those three countries have dropped considerably, by that metric, you could argue she did help.
But again, she did not have presidential powers to stop immigration, which is handled by the Department of Homeland Security, so her role was defacto ceremonial. She was also handcuffed by Biden's policies and the unwillingness of Congress to provide any help for the needs at the border.
She has repeatedly stated that if she's elected she will add thousands of border agents and crack down on fentanyl and human trafficking, so at this point, we can only take her at her word
Kamala just failed on policy. They actually want the future voters, so it was probably an intentional failing. A failure none the less. Americans are worse off due to the immigration policies of Kamala Harris and thus they must be deemed a failure. Just like her.