The only illegals that will EVER get deported are ones that commit crimes within the United States. There is no candidate that is going to endorse wholesale deportation of illegal aliens from the United States. Ever.
Politicians who want to win will promise to get rid of the illegals. I expect some of the Democrat Senators (there are 23 of them up for election this next year) to make that very promise ~ just so they can win.
Currently Republican candidates unwilling to take a stand against the illegals are finding themselves dumped like yesterday's garbage.
Has it ever been done before in the US?