Guidelines stipulating that illegal immigrants should only be arrested if they post a threat took effect this week. The guidelines were imposed by Homeland Security Secretary Alejandro Mayorkas for Immigration and Customs Enforcement (ICE) agents. They’re being challenged in court. Mayorkas said ICE agents shouldn’t move against a person illegally in the United States unless they first obtain and review the person’s entire criminal record, administrative record, and any other investigative information available. The Department of Homeland Security (DHS) said the guidelines will ensure a thorough case-by-case assessment, letting the agency focus on what it described as limited resources on the most threatening illegal immigrants. The primary focus of ICE agents will now be illegal aliens deemed to pose a threat to national security, pose a threat to public safety, or pose a threat to border security. “Today is an important step forward in ensuring that our workforce is empowered to …