What the gov is proposing (fly them back to their country of origin) is one of those measures we were told with some vigour, is illegal.
Syrians, Afghans and others do apparently pass the tests as legitimate refugees.
So who supports sending them to Syria, Afgahanistan?
To stop the immigration industry run by gangs, if the boats were returned they'd be stuck in France, which has problems but is surely better than Syria etc. The folk would see money being lost, so stop trying. I know that's "illegal" too - so pick your "law". Poles did the same.
It would rely on Sunak's supposed alternative legal routes being set up, of course, though Poland didn't suggest any alternative to its barbed wire fences.