It isn't millions each year.
It is about 500K each year and that is split between crossing, visa overstays (primary source of illegal immigration), asylum petition being denied etc.,
It is not an invasion.
The immigration issue is not even #1 for the US.
Real issues such as healthcare affordability and access, gun violence, debt and deficit are being ignored.
All of his major policies are targeting people groups instead of focusing on those real issues.
Also the July 2024 data showed the lowest level of border crossings since September 2020.
So Biden didn't really do a bad job.
Its all blown out of proportion.