There are constitutional and jurisdictional issues raised by the bill. As Workman said, "the feds are going to blow a gasket." As with the Arizona bill this proposal challenges federal authority to control immigration policy and it will butt heads directly with federal immigration enforcement efforts, feeble though they are. Once again this is state government stepping in to do a job which the federal government is supposed to do but has repeatedly failed at, particularly by not enacting a sensible policy like this themselves. Unlike the Arizona law this addresses real problems in a positive way.
Workman is not alone in this effort. A similar bill has already passed in Utah and is waiting for the Governor's signature. If Workman also succeeds here in Texas it's likely that other states will follow his lead when they see it is a more sensible alternative to doing nothing or taking the kind of action Arizona has taken.
I'm pleasantly surprised to see a proposal like this and Workman deserves a lot of credit for coming up with a good idea and not listening to the vocal nativist minority in his own party. A policy like this is good for business, good for legal and illegal workers and makes all of our citizens safer. Creating a more free market in labor reduces crime and increases prosperity for everyone.