The terror attacks in Boston wrecked plans for a quick Friday hearing on immigration reform and prompted Department of Homeland Security Secretary Janet Napolitano to withdraw from the high-profile hearing.

Her withdrawal denied Republican Sens. Jeff Sessions and Chuck Grassley — both opponents of the pending Senate immigration bill — the chance to chance to speak to public worries about terrorism’s relation to the 844-page bill.

“We’re here trying to understand why these events have occurred … so this hearing is an opportunity to focus on the issues at hand,” said Grassley, the lead Republican on the judiciary panel.