President Obama's executive order for Immigration is similar to HW Bush's Exec Order.

http://www.politifact.com/punditfact/statements/2014/nov/20/rachel-maddow/maddow-obama-and-ghw-bush-solo-immigration-moves-a/

Rachel Maddow explains the similarities.  If Congress does not like it, they could pass the immigration bill which has been sitting in the House for 2 years.