The guy is obviously as thick as a brick and brainwashed to put. It is highy unlikely that American has 40 million illegal aliens. (What's a legal alien?)

He got muddled up between legal and illegal. The estimate is that it's 10 million.

Considerating that the US has 330 million people and the UK has 60 million people, but 9.3 million were born in another country (14%), then the US only has a percentage of 9.3% born in other countries.

https://www.pewresearch.org/fact-tank/2020/08/20/key-findings-about-u-s-immigrants/