It's way more than that. Probably 30+ million.
Mass round ups and deportations will never be tolerated by the American people. However, attrition by enforcement of existing laws will work just fine. Those that are caught in the normal course of enforcement can be deported, of course. More effective will be enforcement of laws against employers hiring illegals, and denying them the welfare benefits of free education, medical care, housing allowances, etc. Finally, Congress needs to eliminate the deliberately deceptive "anchor baby" mis-application of the 14th Amendment which is being used confer automatic citizenship on the children born to illegals while here.
BTT
BTTT