So far Trump has deported something like 10k per month, and Biden let in millions. There is no way Trump can put a meaningful dent in the illegal immigrants. 10k * 48 months = 500k deportations during Trump's entire Presidency, less than 10% of the illegals Biden let in.

Someday, there will be another Democrat President, who will open the borders again. Great Replacement is a proven winning strategy for left-wing parties worldwide, because the new replacement voters overwhelmingly vote for left-wing parties.