Hiding under their desks...or under Linda and Midge's skirts.
I think Sessions will hang in there. Saw Mike Lee on Hannity in front of the Senate building, so he'll likely be back. Not sure about Rubio, Paul, Vitter, etc.
Louis Gomert (TX) is in the well, cspan noted. Also a couple more from the House as well.
Shocking absences, however!
The world is watching via Drudge, and obviously tweeting is stratospheric.