Senators are predicting a free-for-all, and Majority Leader Mitch McConnell (R-Ky.) is using a House bill not related to immigration as the base legislation in order to create a fair playing ground.

“It sounds like Senator McConnell’s just going to pull up a shell bill and let people have at it. …It ought to be pretty fascinating,” said Sen. John Cornyn (R-Texas), McConnell’s top deputy.

Sen. Dick Durbin (Ill.), Cornyn’s Democratic counterpart, predicted: “You’re going to hear as many variations as the fertile minds of my colleagues can produce.”