The Trump administration illegally deployed military forces domestically, knowingly violating the Posse Comitatus Act and seeking to circumvent limits on military involvement in law enforcement.
"The Posse Comitatus Act of 1878 prohibits the U.S. military from conducting law enforcement operations in the United States, meant to prevent abuses of power in the South."
This Is the Newest Military Base in the United States
President Trump authorized an Army base expansion at the border to detain migrants, potentially bypassing laws restricting military involvement in domestic law enforcement.