The fallout from the fatal bombings in Boston that federal officials said was staged by two Chechen nationals, is rippling through the debate over immigration reform now underway in the Senate despite reform supporters’s insistence that the issues are unrelated.

Sen. Rand Paul, R-Ky., wrote Monday to Senate Majority Leader Harry Reid, D-Nev., requesting that no reforms advance until “a thorough examination” of the Boston bombing is complete. Paul also wants to add a national security provision to the bill that would “make sure the federal government does everything it can to prevent immigrants with malicious intent from using our immigration system to gain entry into the United States in order to commit future acts of terror.”