Americans should resist "the siren call of the angriest voices" in how the nation treats immigrants, South Carolina Gov. Nikki Haley said Tuesday as the GOP used its response to President Barack Obama's State of the Union address to try softening the tough stance embraced by some of its leading presidential candidates. The U.S.-born daughter of Indian immigrants, Haley said the country is facing its most dangerous security threat since the terrorist attacks of Sept. 11, 2001. That was a reference to the Islamic State group, which has taken credit for attacks in Paris and elsewhere and may have inspired...