From the Washington Post:
He also has told worried subordinates that he will pardon them of any potential wrongdoing should they have to break laws to get the barriers built quickly, those officials said.
Ah yes, our “rule of law” President.
The president has told senior aides that a failure to deliver on the signature promise of his 2016 campaign would be a letdown to his supporters and an embarrassing defeat.
I think that’s overselling it. The entire Trump presidency could be categorized in this way; no need to single out a specific failure.