Put the screen back in the door / put the screen door back on / find a cheap one somewhere. Grab a pair of scissors you don't care about and cut an appropriate hole in your screen door (large enough for tube to fit through, into the house a few inches).
If the screen gets flimsy around the cut, cut a halo of cardboard 2-3" wide to reinforce it, and sandwich screen between two layers of cardboard with hot glue.
If the cats get aggressive, find some way to hook the tube-thing to the cardboard. (loops of mild steel wire, like oversized twist-ties, would probably work well.)
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