British Foreign Secretary Boris Johnson says it is "unthinkable" that European Union citizens living in the U.K might be sent away or lose their rights after Brexit. Asked by reporters in Portugal Friday about EU citizens' rights — a key issue in Brexit negotiations — Johnson says he "cannot imagine circumstances in which the 400,000 Portuguese or the 1 million Poles in the U.K. are going to be asked to leave or to have their rights damaged" after Britain leaves the bloc. Portuguese Foreign Minister Augusto Santos Silva said there are "one or two points to resolve" with Britain over post-Brexit citizens' rights. He says Portugal believes that a British proposal requiring current EU residents in the U.K. to register for permanent residency status is "unnecessary." British officials have said the process will be easy and inexpensive.