Miami-Dade County Mayor Daniella Levine Cava sent a letter to Florida's attorney general requesting access to and monitoring of the detention site, which was built on county land.

"That's not the Walton County I know, and it's not the Florida I believe in. The people here weren't asking for anything unreasonable. They just wanted to keep doing what they've always done ...

Florida's attorney general says the migrant detention facility is on track to open in early July, at a little-used airfield in the Everglades. Environmental activists hope they can stop the project.