Immigration and Customs Enforcement had originally detained Khalil because the government said he was a threat to its foreign policy goal of preventing antisemitism.

The Trump administration is keeping Columbia University alumnus Mahmoud Khalil detained, despite a judge's Wednesday order for his release.

Khalil has not been charged with a crime. The Syrian-born Palestinian refugee is one of several foreign nationals the Trump administration has accused of posing a national security threat due to alle...