Why do conservatives ask if we would welcome undocumented people into our homes?

Like, I don't get why they think that's a gotcha. Most people wouldn't welcome any stranger into their home these days so what is the value of asking if you'd welcome illegal immigeants into your home.

I genuinely don't get the point they're trying to make. I could respect it if they asked would you welcome them into your neighborhood? Presumably I'd disagree with them and discuss why. But the home is just so irrelevant here.