(Trent Nelson | The Salt Lake Tribune) Rep. Stephen Sandstrom does a pre-flight inspection of his airplane (a Cessna 340) at the Spanish Fork-Springville Airport Wednesday, January 12, 2011. Sandstrom is a former pilot, Marine and the architect of an Arizona-style immigration bill that has become the face of the 2011 legislative session. (Scott Sommerdorf l The Salt Lake Tribune) Rep. Stephen Sandstrom, (R, Orem), presents his opening remarks about his immigration bill at Thanksgiving Point, Friday, 1/21/2011. (Francisco Kjolseth | The Salt Lake Tribune) Rep. Stephen Sandstrom argues over maintaining a balance of compassion and the rule of law during a press conference in support of his immigration bill at the Utah State Capitol. In background is Rep. Chris Herrod. Salt Lake City Nov. 17, 2010. (Francisco Kjolseth | The Salt Lake Tribune) Rep. Stephen Sandstrom, R-Orem, is surrounded by opposition as he unveils his immigration bill on Friday, Aug. 13, 2010, at the Utah State Capitol which takes a harder line stance against immigrants who are in Utah illegally. Salt Lake City Aug. 13, 2010. (AL HARTMANN | Tribune file photo) . Former Rep. Stephen Sandstrom, R-Orem. (Trent Nelson | The Salt Lake Tribune) Rep. Stephen Sandstrom, accompanied by two Utah Highway Patrol Troopers, at the state capitol in Salt Lake City, Utah, Tuesday, February 15, 2011. Sandstrom, and Rep. Chris Herrod reported receiving threatening letters after their work on immigration reform bills.