The top border official in the Biden administration admitted to being caught off guard recently by the spike in delta variant coronavirus cases among migrants at the border.... ...Mayorkas, who has for months refused to speak on the risk that infected migrants who are released into the United States pose to border communities, said upwards of 20% of that population are sick with the highly contagious disease. "We are confronted with a population of people that, as a general matter, that have a rate of illness of approximately 20%," said Mayorkas, who has been in his position since January. "When...