In total, there were about 156,000 illegal aliens “encountered” by Customs and Border Patrol (CBP) personnel in January — 128,000 detained at the border, and 28,000 stopped at ports of entry. In the 15 years between May 2006 and May 2021, monthly apprehensions exceeded the January 2023 total of 128,000 only once — in May 2019, when slightly fewer than 133,000 encounters were recorded.
https://www.nationalreview.com/2023/02/bidens-sotu-boasts-about-decreasing-illegal-immigration-were-fraudulent-too/
So the only time there was more illegal immigration than under Biden was under Trump.
There has never been a problem as easily and cheaply solvable that encounters such intractable refusal to be solved.