You mean the wall that had multiple useless sections built with American taxpayers money and he absolutely would have continued with if not for the inherent logistics issues of physical reality and lack of competent enablers that aren't blockers this time around?
Also, the 2016 administrator WAS catastrophic. The hyper consolidation of corporate actors, deregulation and defanging of admin agencies that effectively removed all culpability from corporate actors, and bureaucratic damage that has made recovery a steeple uphill battle all happened not just under his watching but as an explicit intent of his watch.