Republicans on the House Administration Committee want to shore up voter registration rules in the wake of a Colorado study that found as many as 5,000 non-citizens in the state took part in last year’s election. Rep. Gregg Harper (R-Miss.), the panel’s chairman, called the study “a disturbing wake-up call” that should cause every state to review its safeguards to prevent illegal voting. “We simply cannot have an electoral system that allows thousands of non-citizens to violate the law and vote in our elections. We must do more to protect the integrity of our electoral processes,” Harper added. Colorado Secretary...