The evidence of his first term disproves your statement here. Trump significantly lowered legal immigration, and kept the absolute # of illegal immigrants in the U.S. static, which with a growing U.S. population means over time real world decline. And the only reason why Trump wasn't able to deport more illegal immigrants was because so many local jurisdictions (and federal employees, >90% of whom are Democrats) didn't cooperate, so it's not really Trump's fault that he couldn't get an absolute decline in illegal immigrants. https://www.cato.org/blog/president-trump-reduced-legal-immigration-he-did-not-reduce-illegal-immigration - Now, a better leader than Trump could perhaps have convinced local jurisdictions to cooperate in deporting illegals. Sure. But Trump did make some significant accomplishments on this issue.