A very small number.
This gets back to the concept that you don't own your country unless you know who is in your country. The first step needs to be the registration of all illegal immigrants in the U.S. -- any with a felony record will be deported. The many others who are hard-working individuals will get a multi-year renewable Visa. These people add value to our economy. Who is going to build your home, process your meat, pick your crops and other jobs that are hard to find labor for. Let's get these people out in the light and incorporated into our economy as legal workers.
Okay so we keep them here. Then they can be considered felons for invading our country and be denied voting privileges. The only reason the Dems want them in this country is for the votes. There is no way that can not be denied as a fact. As far as adding value to our economy it is thought that a lot of illegal aliens send a lot of their money back to Mexico. As far as the jobs you mentioned, black people can do them. They seem to believe they can not find jobs. Maybe this is one reason why. (I am sure that it is).
I mean really. What is there, 30 million illegal aliens in the USA? My god.