As shit as Roberts' SCOTUS is, I don't think even they'd go that far. Their entire argument hinges on one phrase from Article Two:
he may, on extraordinary Occasions, convene both Houses, or either of them, and in Case of Disagreement between them, with Respect to the Time of Adjournment, he may adjourn them to such Time as he shall think proper;
Supposedly as long as neither the House nor the Senate alter their scheduled appointment dates this clause can't be invoked.
Then they could just stay on their side of the border?