U.S. to send deportation case notices to 78,000 migrants who were not fully processed

The U.S. government is expected to launch an operation next week to send court documents to 78,000 migrants who were not processed for deportation after crossing the U.S.-Mexico border without authorization this year, two people briefed on the plan told CBS News.

Starting Monday, U.S. immigration authorities will dispatch packets of legal documents that will instruct migrants, many of them families with children, to show up to court hearings before immigration judges, who will determine whether the new arrivals will be allowed to stay in the country, the sources said.

The U.S. Immigration and Customs Enforcement plan, dubbed "Operation Horizon," is designed to place tens of thousands of migrants who received ad hoc processing near the southern border into deportation proceedings. The agency will be sending migrants "notices to appear," as well as other documents.