Try expediting anything in legal immigration. Try legal immigration with a criminal record. Try legal immigration with no visible means of support. Can’t happen.
Expedite was Trump’s word, not mine.
If, as you say, it cannot be done, why would he tell us that his plan is to expedite their legal return back into the USA?
If we do not expedite those that are coming in legally, why should we expedite those who came here illegally?
I do not think it is fair or wise to give them any status similar to those who did not break the law first, by coming in illegally. You will just ask for more of the same behavior.