Florida lawmakers worried about “humanitarian concerns” were denied entry into the new detention center dubbed as “Alligator Alcatraz” Thursday, just hours after the arrival of its first group of detainees.

State law says members of the Legislature are allowed to “visit at their pleasure all state correctional institutions.”

The first group of immigrants are set to arrive at a new detention center deep in the Florida Everglades that officials have dubbed “Alligator Alcatraz.”