Mahmoud Khalil--the pro-Palestinian activist and green card holder detained byImmigrationand Customs Enforcement this week--said he overheard federal agents say that the White House was asking for an update on his detention, his attorneys said." He was surrounded by many DHS agents, or people he believed to be DHS agents, and he believes that he saw or heard, during a call, one of them say that the White House wants an update on what's going on," Samah Sisay, a staff attorney at the Center for C