You can look at the CBP link and see about 3 million a year x 4 years is ~12 million.
Securing America's Borders
www.cbp.gov
As Kamala Harris visits the border, BBC Verify assesses a Trump claim about the Biden administration's immigation record.
www.bbc.com
Since January 2021, when Joe Biden came to office, there have been more than 10 million encounters -
about 8 million came over the southwest land border with Mexico.
Add in an estimated 2 million "got-aways" and you get about 12 million illegals entering under Biden.
Here is the link showing about 2 million deported in 2025:
DHS announced that 2 million illegal aliens have been removed or have self-deported since January 20.
www.dhs.gov
So my numbers are better than your typing