The arrests of six Middle Eastern men caught entering the United States illegally from Mexico two years ago set off alarm in border states.
Arizona Gov. Doug Ducey called it a matter of national security and invoked the Islamic State group in a statement calling for stepped-up border security in response to the arrests.
The five men from Pakistan and one from Afghanistan were arrested at a time when the Islamic State group was committing some of its bloodiest acts, just days after coordinated bombings and shootings in Paris heightened fears about attacks in the U.S.
Despite the facts, government officials under the Obama administration had long denied there have been any arrests of migrants at the U.S.-Mexico border with ties to the Islamic State.