Illegal: (adjective) against the law

This word can NEVER be used to describe a human being. Period. It can’t be a noun either.

An action can be illegal:

• It is illegal to steal.
• His involvement in the crime was illegal.

A thing can be illegal:

• The website was taken down for illegal content.
• The modifications to the car made it illegal on the roads.

But a human’s existence or presence in a country is never illegal.