Citation needed please.
Is Illegal Immigration Linked to More or Less Crime? - FactCheck.org
Immigration and Crime - Oxford Research Encyclopedia of Criminology
Or just search the internet with this query: https://www.google.com/search?q=crime+rates+citizens+vs+illegal+immigrants+usa
This does not mean open borders to anyone who wants to enter. But it means that we should have a rational discussion of how to handle a flood of people in a decent, caring but careful way to as much as possible screen out those who are undesirable or don't have a valid reason for trying to enter the US.