The Department of Homeland Security proposed a rule Monday that would raise the cost of U.S. citizenship by as much as 80 percent. Under the plan, online naturalization applications would jump from $710 to $1,280, and paper filings from $760 to $1,330. Appeals for denied applications would climb from $830 to $1,475 by paper. The rule would also scrap fee waivers and the reduced-fee option for applicants earning 150 to 200 percent of the federal...