In 2006 the united states congress considered several immigration reform bills. all of the following measures were proposed, except

illegal immigrants would be encouraged to do "self-deportation" by volunteering to leave.

legal immigrants would have to work in the u. s. for 17 years before becoming eligible for u. s. citizenship.

the u. s. would build a double-layer fence across 700 miles of the mexico-u. s. border.

legal and illegal immigrants would have tracking numbers and barcodes tatooed on their right shoulders.