GUATEMALA CITY (AP) — The Trump administration's failure to test all but a small percentage of detained immigrants for the novel coronavirus may be helping it spread through the United States' sprawling system of detention centers and then to Central America and elsewhere aboard regular deportation flights, migrants' advocates said Friday.

The discovery of numerous COVID-19 cases among deportees on a flight that arrived this week prompted Guatemalan President Alejandro Giammattei to tell Guatemalans in a national address on Friday he was suspending such flights — a step his foreign minister ha...