That’s who elected him the first time and who will re=elect him.
President Trump brought some over from the Democrats but his real strength is among people who had given up choosing between evils.
No number of stealth voters can overcome the Democrat Big City manipulation of the vote count. In each state the big cities report last and the Dems know how many votes they have to add to the count. It was done that way in a few states in the past. It will be done that way in fifty states in November for a Democrat 49-50 state blowout unless forestalled.