Naaa.
Won’t take them back? Ok. No more aid for you.
If Russia (or whoever) attacks you. Don’t call us. We are busy.
IIRC Trump did this, at least with some countries.
Trump previously promised to cut off countries like India and China if they did not take back deportees. He failed to follow through and those countries still don’t take them back. Why think he’d do any different in a second term?