To be fair, he's suggesting remigrating the illegal immigrants, that are millions in Europe. Unfortunately the European asylum laws are a big loophole: if you claim asylum and you're subsequently denied (sometimes after months or years), there's no legal way of sending you back to your original country against your will. That's why the hard right (and soon the center of right, and maybe some parts of the left) insists on remigration: because it's the only way of avoiding / responding to illegal immigration with the laws we have today.
> Remigration is a far-right concept referring to the ethnic cleansing[1] via mass deportation of non-white minority populations, especially immigrants and sometimes including native-born citizens, to their place of racial ancestry.