Around a third of U.S. adults (35%) incorrectly said that most immigrants are in the country illegally, while 6% said about half of all immigrants are here illegally and half legally. (Right answer: one quarter.)
A majority of non-college grads of both Republican and Democratic leanings said in June 2018 that most immigrants are here illegally. The lowest number of the majority-are-here-illegally opinion were Democratic college grads, and even that was 20%.
About half of conservative Republicans (47%) believe that unauthorized immigrants commit more crimes. Of all Americans, 26% believe they commit more crimes, and only 6% of liberal Democrats believe they do.
In a mid 2018 survey, Nearly three-quarters of Republicans and Republican-leaning independents (74%) support expanding the wall, while an even larger share of Democrats and Democratic leaners (83%) oppose it.
Nearly three-quarters of Americans (73%), including 89% of Democrats and 54% of Republicans, said in June 2018 that they favor such permanent legal status.
From Pew Research