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.

The detention immigration facility is located in an idle airstrip in the Everglades that the DeSantis administration recently seized from Miami-Dade County using emergency powers.

President Donald Trump is visiting "Alligator Alcatraz" on Tuesday, July 1. Here's what to know about the trip and the detention center in Florida.