Senate : Sens . John McCain and Lindsey Graham say Boston bombing prove critical for immigration reform . Sen. Chuck Grassley says Boston bombings raise new immigration reform concerns . Tighter security has long been a key immigration reform demand for many conservatives , who argue that current border controls remain insufficient . Sen. Chuck Schumer says senators should n't jump to conclusions . Bipartisan immigration bill aims to tighten border security , create path to citizenship .
Senate : Sens . John McCain and Lindsey Graham say Boston bombing prove critical for immigration reform . Sen. Chuck Grassley says Boston bombings raise new immigration reform concerns . Sen. Chuck Schumer says senators should n't jump to conclusions . Bipartisan immigration bill aims to tighten border security , create path to citizenship .