zab, You're right. Trump did not reduce illegal immigration. Facts to Trump, conix et al, are of no value unless they fit their cause.
Illegal immigration rose significantly while Donald Trump was president, much of it driven by Central Americans fleeing their homes. Apprehensions at the Southwest border, a proxy for illegal entry, increased by more than 100 percent between FY 2016 .. https://www.cbp.gov/sites/default/files/assets/documents/2018-Mar/CBP-fy2016-border-security-report.pdf .. and FY 2019 .. https://www.cbp.gov/newsroom/stats/sw-border-migration/fy-2019?language_content_entity=en .. (from 408,870 to 851,508), according to a National Foundation for American Policy analysis. In March 2020, with the onset of the Covid-19 pandemic, Border Patrol encounters declined. However, Border Patrol encounters on the Southwest border increased from 16,182 in April 2020 to 69,032 by October 2020, a rise of 327%.
Much of the increase in illegal immigration after Biden took office reflected the end of the Covid-19 pandemic, a more robust U.S. economy relative to the rest of the Western hemisphere and a large-scale refugee crisis in the region .. https://nfap.com/studies/the-historic-refugee-crisis-in-the-western-hemisphere/ . Government repression and economic problems in Cuba, Venezuela, Nicaragua and elsewhere have played a significant role in pushing migrants to the U.S. border.