LANCASTER, Calif. – The asylum seeker from Somalia hung his head as an immigration judge grilled him about his treacherous journey from the Horn of Africa. By air, sea and land he finally made it to Mexico, and then a taxi delivered him into the arms of U.S. border agents at San Diego. Islamic militants had killed his brother, Mohamed Ahmed Kheire testified, and majority clan members had beaten his sister. He had to flee Mogadishu to live.