U.S. Citizenship and Immigration Services has asked Congress for a lifeline amid the coronavirus pandemic that has caused applications to plummet and brought it to the brink of insolvency.A naturalization ceremony in 2019 administered by the U.S. Citizenship and Immigration Services in Los Angeles. Credit...Etienne Laurent/EPA-EFE/ShutterstockMay 17, 2020LOS ANGELES — A precipitous drop in applications for…