The U.S. government has blocked a United Nations expert from visiting a jail in Texas where the U.S. is holding up to 400 immigrants, including children and asylum seekers. The U.N. special rapporteur on the human rights of migrants, Jorge Bustamante, is in the middle of a three-week fact-finding mission to examine how immigrants are being treated in the United States. Bustamante had planned on visiting the Hutto immigration facility in Taylor, Texas, today, but his visit has been blocked by Immigration and Customs Enforcement. Earlier this year, the American Civil Liberties Union filed a federal lawsuit on behalf of 12 children detained at the Hutto facility, charging that the children are subject to inhumane treatment.